Dear Jeff, first of all, thank you your quick and helpful response!
My apology, I forgot to mention that for now the sheet contanis columns for each student. So the lesson comes in (from the GForm) with a new line and there are 16 columns for each student with a checkmark.
Here is a screencap. Blue is for lessons, green is for students.
Of course I can rearrange the logic to follow the opportunities in Glide if I have to.
So I’d like to Filter users by columns since I would like them to check their finished lessons. As you can see, for now they can see each others process, it would be fair to let them see only theirs by the Lesson. I think I miss a logical step.
Glide Forms. Thank you, yes, I do want to do it but I have to keep in mind that the teachers are got used to the Google Forms and they have to upload documents, pictures and so on (and they still have to learn how to use the Google Drive and system). So this could be a second step.
And Ohh, I’m a free user!
…Somehow an “Is Favorite?” Column appeared… And… “Column is user specific…” at the boolean… And other features appearing… Guys… Are you just refreshing your Glide right now?
I am stunned. This is my first experience of such a support! It simply works. So great, thank you from my heart!!!