here you go mate, exactly what you are looking for : https://github.com/little-book-of/linear-algebra#contributin...

Every contribution is welcome: whether it's criticism, fixing typos, or even completely rewriting a section!

Writing this book has been a real challenge for me, since all the books I enjoy reading are very formal ones :))

Anyone here into Grothendieck's SGA or EGA? (Sorry, a bit off topic!)