Editor basics

Line numbers are displayed by default, but you can hide them by clearing the Show line numbers checkbox on the Editor | General | Appearance page of JetBrains Rider settings Ctrl+Alt+S.

Code folding adornments help you expand and collapse code elements.

Action indicators show that one or more actions are available for the current caret position. To see the available actions, press Alt+Enter or click the indicator.

Breakpoints let you suspend program execution at the marked statement.

Bookmarks let you mark code lines where you want to return later.

Syntax and error highlighting — while syntax highlighting improves the readability of clean code, error highlighting helps to visualize detected code issues.

Breadcrumbs at the bottom of the editor show and allow navigating the structural path from the top of the file to the current caret position.

Editor tabs help you manage multiple open documents.

File status indicator displays the number of code issues detected in the current file.

Error stripe shows different code items as clickable markers relative to their locations in the document.

Inlay hints are automatically inserted into your code to improve its readability.

Code vision adds various helpful information to types and type members.

'Pencils' widget is a single entry point where you can configure highlighting and visual helpers for your code.