Is it good not to use your MacBook Pro like more than 2 months and keep it powered off

Make sure that it is charged to at least 50% before you stop using it.

Shouldn’t be a problem. Some try to discharge to the middle of the charge range for any storage, but that’s not strictly needed.

See the long-term storage info here: Batteries - Maximizing Performance - Apple

If you’ve previously stored the Mac and are now resuming use and are having issues, what might those issues be?