I have always found “on-the-job training” and solving problems and learning from fixing them the best form of education rather than from books or courses.
Linux has its own jargon and acronyms which involves learning, but nowdays help is freely available on forums like this, if you search or ask questions.
PS: You may wish to download and have a read of @Swarfendors unofficial manual for Zorin 15 here: Unofficial Manual for Zorin 15