Despite the solr official website reports a lot of documentation, it appears incomplete and out of date, for sure not applicable to current solr version (9.6 at the time I'm writing); moreover solr installation procedure (see below) appears to be unable to install correctly on RHEL 9 based distros like AlmaLinux.
These notes to document my journey in solr installation and experimentation getting it up and running.
Warning
The usual disclaimer: I'm not a solr pro, I'm learning; if somebody has more efficient way to do things pls let me know and I'll be glad to update these docs accodingly.