Bookmarks
Mark a line (Shift+Alt+B), jump to the next (Shift+Alt+N) or previous (Shift+Alt+P) bookmark in the file, or list all bookmarks in all files and jump to one. A counter shows in the status bar. Bookmarks are saved by the editor and come back next time.
Bookmarks are tied to line numbers, so after big edits above a bookmark it may point a few lines off.
Permissions: workspace.read (to open the file when you pick a bookmark from another file).
Sidebar
Since 1.1.0 an icon in the activity bar lists every bookmark, grouped by file. Bookmarked lines show a star in the gutter and a soft highlight.