Open Grape, create a note and start typing. That is the whole setup. The one thing worth knowing is that inserting content works differently on desktop and mobile.
On desktop: the slash menu
Type / on an empty line to insert anything the editor supports: headings, checklists, tables, images, PDFs, a drawing canvas or a voice recording. Markdown shortcuts work as well, so # followed by a space becomes a heading and - followed by a space starts a list.
On mobile: the toolbar above the keyboard
There is no slash menu on the phone. Instead, a formatting toolbar sits directly above the keyboard. It holds text styles, checklists, tables, the voice recorder, the drawing canvas, highlights, attachments, links and more. The row scrolls sideways, so if you do not see a button, swipe the toolbar.
Give the note a home
Notes do not need a folder, but they are easier to find in a month if they have one. See Create folders and subfolders.
Pin what you keep coming back to
Pinning holds a note at the top of the list. Most people end up with two or three pinned notes: a daily scratchpad, a running to do list, and whatever project is loudest this week.
One habit worth forming
Write the note badly and move on. Search works on meaning, so a rough note with the right ideas in it will still come back later. Tidy notes are nice, findable notes are useful.