Opening project folders
A project folder is a folder that contains files and subfolders related to a project. If you want, you can also define a project file (see Running code), but this is only necessary if you want to customize how your project is executed/ compiled.
ctrl+shift+o activates the folder selector. This shows a list of recently opened project folders, which you can quickly search through and select; or you can select 'Browse disk …' to open a new project folder.
ctrl+\ hides or shows all currently opened project folders, by default on the left side of the window.
ctrl+o activates the file selector. This shows a list of all files in all currently opened project folders, which you can quickly search through and select; or you can select 'Browse disk …' to open any other file.
Selecting symbols (classes, functions, heading, etc.)
ctrl+r activates the symbol selector. This shows a list of all symbols in the currently active file. Depending on the language of the file, symbols are function and class definitions (for Python and R), or headings (for Markdown).
ctrl+shift+p activates the command palette, which provides quick access to all the options from the menu.