Hi guys!
I used to download a lot of PDFs of textbooks for languages I wanted to learn, but it was really frustrating and expensive to keep printing out the pages I wanted to use every day.
So I'd been looking for a solution for a long time, and I finally found something that works. I downloaded a PDF reader called Foxit, it has the ability to let you draw on the pages, insert notes, and type in your own stuff where you would normally write on it.
I thought it might be useful for you guys! I'm now using this for my Japanese and German textbooks. I hope you find this tip useful! :)