There is alot of things to read here in the community, all depends on how you actually learn.
I myself i normally try to watch videos such as https://www.udemy.com/course/checkpoint-jump-start/
or free content on youtube.
I do also need to lab and actually try things out to remember the things and know how to apply it.
For the CCSA you can go a long way by playing around in the smartconsole.
But best thing would be to build a own little lab in vmware or similar and build the stuff.
No better learning than breaking stuff and then try to fix them 😄