Let me start with a disclaimer: I am a happy Google Keep user so I don't make any claim not to be biased in this post. Just kidding:) but frankly, it's a wonderful app in my experience. Its web-version is equally useful and allows me to use my notes with other applications. I don't remember how I was living (or managing) without it. For the sake of completion, let me try to recall:) Before Keep, I was using hand-written notes, I had tried apps like Evernote, Google Calendar, Notepad, etc. but never became so habitual with any of them that they could become an essential part of my life.
Google Keep: First and Foremost use
As I type, it auto-saves and I can edit using 'Undo' and 'Redo' circular arrows in the middle of the ribbon (just below the note I am creating) which also displays a + button on the left which allows me to add photos, check-boxes, voice recording, etc.
Collaborate with othersToward the right end of the ribbon, there is a 3-dot menu button. The menu offers the following items: Delete, Make a copy, Send, Collaborator, Labels and colour options. I can use any of the colours for my note e.g. I use red for an urgent or very important task. I can add people as collaborator to share this note with them. S/he (the collaborator) will get an email and can open and edit the note.
You may like this blog post for other important features: 8 Tips to help you keep up in Google Keep. Thanks for stopping by and have a great time.