Google Docs is a powerful word processing tool many schools have adopted. As it's similar to Microsoft Word and others, its features are intuitive to use.
I know many people use Google Docs for collaborative writing - I used to use Google Docs all the time as well, but OneNote Online is my new favorite! It has a book-like layout and you can create several tabs for different groups so everyone has their own space (their own page in a tab), which is less confusing than Google Docs.
You can plan events, make a survey or poll, give students a quiz, or collect other information in an easy, streamlined way with Google Forms. You can create a form from Google Drive or from an existin
Google Forms are great for quick surveys and even quizzes (provided you don't need answer checking/feedback). SurveyMonkey isn't hard, but the free version has certain limits, and Google Forms is even easier to get up and going.
One of a series of articles by Richard Byrne available on issuu, where he explores how Google can be used by instructors. He has a series of other publications covering various topics/how to guides. Highly recommended!
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Personal experience: I have found these posters to be great for interactive review materials and enrichment. It's a quick way to organize anything you can post using Google Docs (so Google Forms (quizzes), Slides, etc...), websites, images, YouTube videos, etc... and the first 5 or so posters are free. The best part is it is very user-friendly. I highly recommend trying it out!
I have used Poll Everywhere, Padlet, Google Docs/Forms for checking students' group work in class, but I've always wanted a simple tool that takes a second for students to complete and another second for me to check their completion but a tool where students don't get to "cheat" by peeking at what other groups are writing because they can't see what other students are typing until they post their answers!
Apparently there is no such thing as too much participation in online discussions. Participation in discussions (as measured by words posted) scales linearly with grade on test.