There are open-source alternatives like; Inkscape as an alternative for Illustrator; and Scribus for Indesign.
They basically serve the same purposes but the toolset varies quite a lot and to be honest, are quite limited at times.
And if you are receiving instructions on Adobe Software like we do, then it's not going to help you much either.
Bottom line is, you can probably make do with these but you are better off getting a students license for Adobe anyways.
this one is great for an intro! easy read and has images in for reference. it's short and concise but really packs a decent amount in. https://www.amazon.com/Modern-Architecture-Short-Introduction-Introductions/dp/0198783442