This repo contains all the good sources for using the Maxima CAS Software
You can read a single one or any combination of these books to obtain a good primer on Maxima.
https://cambridgescholars.com/product/978-1-5275-1117-0
https://home.csulb.edu/~woollett/mbe.html
https://www.amazon.com/Symbolic-Mathematics-Chemists-Guide-Maxima/dp/1118798694
Once you finish your first maxima book/s. You can then proceed to the manual to add whatever else you may need to your repertoire.
https://maxima.sourceforge.io/docs/manual/maxima.pdf
https://maxima.sourceforge.io/docs/xmaxima/xmaxima.pdf
https://maxima.sourceforge.io/docs/tutorial/en/gaertner-tutorial-revision/Contents.htm
https://maxima.sourceforge.io/documentation.html
https://wxmaximafor.files.wordpress.com/2015/06/wxmaxima_for_calculus_i_cq.pdf https://wxmaximafor.files.wordpress.com/2015/06/wxmaxima_for_calculus_ii_cq.pdf
https://link.springer.com/book/10.1007/978-1-4939-3207-8
https://link.springer.com/book/10.1007/978-3-030-43388-8
https://link.springer.com/book/10.1007/978-3-030-17199-5
https://home.csulb.edu/~woollett/cp.html
https://home.csulb.edu/~woollett/eam.html
Join the mailing list https://maxima.sourceforge.io/maximalist.html
If you know or have other good resources for maxima please make a pull request