\d matches a single character that is a digit.

During start-up, a Windows Session is created for the System Processes to run which are not related to a specific user, this is called Session 0. This session allows Windows to run system processes needed for the machine itself. When a user logs on to that machine, a new session is created called User Session in which user-specific services run.
– docs.uipath.com

The data table in the output field will always be written to, regardless of whether it already contains data.

[a-zA-Z] returns a match for any alphabetical character between a and z, either lower OR upper case.

Read Range (uipath.com)

Activity-specific properties will take priority.

A background process doesn’t need to interact with UI elements on the screen but rather relies on background processes to pass along information. UIAutomation activities should not be used in these project types. Multiple such processes can simultaneously run on a machine, even if a foreground process is already running.
– docs.uipath.com

Because the input and output data tables are the same data tables, and the filtering parameters are correctly set, the original data table will be overwritten.

The orange button indicates that the selector has been changed and is ready for validation.

Continue will always continue.

The following must be performed prior to using the REFramework without Orchestrator.
1. Remove the “Get transaction item” activity from the project.
2. Remove all “Set transaction status” activities from the project.

Find more information here! Managing Projects with GIT (uipath.com)

\s matches a white space character (line breaks, spaces, tabs).

{0} corresponds to the given string in the 0th spot and the {1} corresponds to the 1st spot regardless of the location of the {0} and the {1} in the input string.

SimulateType is the fastest and most accurate method.

\w matches a word character (alphanumeric characters and underscore).

Find more information here! Managing Projects with GIT (uipath.com)

Checkout the introduction to logging course on the UiPath Academy website.

You can read excel files without excel installed if you use the workbook activities, which are separate from the excel file activities.

Many questions can be solved with available information, even with some missing information. Make sure you obtain ALL information, as the smallest check button in the properties panel can drastically change the answer to the question.

Question mark (?) – replaces a single character.

While it is best practice to remove the “idx” most of the time, when the “idx” is 1 or 2, it is often necessary to keep the “idx”.

The caret is used to negate the specified pattern.

Background Process Automation with Unattended Robots are started from the via the Robot Service and run in the Windows Session (Session 0). It’s important to know that Session 0 has no User Interface and cannot interact with a user session. When using this type of processes on Unattended Robots keep in mind that they run in the name of the user and they inherit its permissions. Make sure that the user under which the process runs has access to the needed resources and that the process does not require any type of User Interface. See the Windows Session document for more details on how windows sessions are being handled by the UiPath Robots.
– docs.uipath.com

Of the following selections, Extract Structured Data is the only activity that has a DelayBetweenPagesMS value.

Always use SimulateClick or SimulateType if you are not using hot keys (use SendWindowsMessage if you are using hot keys). sometimes the hardware driver method must be used for legacy applications.

Changes must be committed AND pushed in order to update the remote repository.

Global settings will affect all activities that have a TimeoutMS property.

Variables must be used- not wildcards.

Checkout the Introduction to Logging course on the UiPath Academy website!

Check out the Introduction to Logging course on the UiPath Academy website!

Robot Execution logs can be used to supervise, diagnose and debug processes in production, gather process performance data or even track business results like total value of transactions processed. Robot Execution Logs can be either Default Logs or User Defined Logs. Default Logs are generated automatically when certain events take place. Execution Start logs under Robot Execution Logs is generated every time a process is started.

The four types of logs are: 
Orchestrator Diagnostic Logs
Setup Logs
Robot Logs
Studio Logs

Default Logs are generated automatically when certain events take place. The events logged by this category are:
Execution Start is generated every time a process is started (Level = Information)
Execution End is generated every time a process is finalized (Level = Information)
Transaction Start is generated every time a transaction within a process is started (Level = Information)
Transaction End is generated every time a transaction within a process is finalized (Level = Information)
Error Log is generated every time the execution encounters an error and stops (Level = Error)
Debugging Log is generated if the Robot Logging Setting is set to Verbose and contains, activity names, types, variable values, arguments etc. (Level = Trace)
Check out the Introduction to Logging course on the UiPath Academy website!

If there is an error in the Init state, the process is immediately ended. If the initialization has errors, it will not bother moving onto taking in transaction items.

If the Process Transaction state fails, the project moves back to initialization. Take a look at the REFramework and the error-arrows.

Interactive – Waits for the target app to indicate readiness, although some assets may still be loading.

DelayAfter – adds a pause after the activity, in milliseconds.
DelayBefore – adds a pause before the activity, in milliseconds.
TimeoutMS – specifies the amount of time (in milliseconds) to wait for a specified element to be found before an error is thrown. The default value is 30000 milliseconds (30 seconds).
WaitForReady – Before performing the actions, wait for the target to become ready.

The Wait Attribute activity is the only method that ensures that the element will be ready before the activity attempts to interact with the element.

When hovering over the different possible executions for the project validator, descriptions will be given for each activity.

The get transaction items state acts as the dispatcher. The process transactions items state acts as the performer.

Once an asset is created, the asset type cannot be changed.

The Invoke Method activity has the proper settings and will correctly add the “4” to the end of the Numbers list.

In the Instance Method, the object from which the method or members are derived needs to be defined.
If it’s an instance method, the TargetObject is used and the TargetType is set to (null).

When a class is defined as static, we don’t need to define the object. Thus, the static method can be called directly.
If it’s a static method, the Target Type is used and the TargetObject field should be left blank.

Checkout the Invoke Method and Code course on the UiPath Academy website!

To figure out whether a method is a Static or an Instance method, you can check the Method signature in on the MSDN website.

SimulateType and SendWindowsMessages both can interact with hidden windows. Default cannot.

Get Latest Version downloads the latest version of the selected item from the TFS/SVN server.

is a top level selector showing the application that the selector is attached to.

In the Unique Reference field, you can select Yes or No, to indicate if you want transaction references to be unique or not. This is useful if you have a queue full of items, such as invoices, that should be uniquely identified.

Any queue items that have not had their transaction status changed will be set to abandoned after 24hr.

Options for Get Outlook Mail Messages
Filter – A string used as a filter for the messages to be retrieved. Accepts JET Queries or DASL Queries.
FilterByMessageIds – Returns only mail messages that match the specified message IDs. If set, the Filter option is ignored.
MarkAsRead – Specifies whether to mark retrieved messages as read. By default, this check box is cleared.
OnlyUnreadMessages – Specifies whether to retrieve only unread messages. By default, this check box is selected.
OrderByDate – Orders mail messages by date. The available options are NewestFirst and OldestFirst.
Top – The number of messages to be retrieved starting from either the newest or the oldest, depending on the OrderByDate parameter.

Try it out for yourself and checkout the arguments course on the UiPath Academy website!

Selectors should only be valid for a single element.

Zero is used to get all results. Check out docs.uipath.com for more information!

1 – Check out the variables panel in the REFramework in UiPath Studio!

0 – Checkout the REFramework in UiPath Studio!

0

You can select the Private property check box from the activities that use sensitive information.

Checking for fatal level logs is an important indicator when debugging.

Check out the introduction to logging course in the UiPath Academy website!