You should check out Youtube channels for the introductory and detailed videos on how to operate the software.
For example there is this channel called "computersNstructures". This channel maintains many videos related to the SAP 2000. And you can learn the software step by step. Though it covers basic, so any new or old version should be applicable for the use.
There are many other channel owners who maintain such information. I'd suggest you to check it out. https://www.youtube.com/watch?v=2povDdw2pTQ
Apart from youtube you can also check out the official software documentation and forums. This way you can get the idea of how to use the software and learn it's components.