i have a MacBook Pro 2021 with Monteray OS. can I update that OS ti OS 13 safely?

A 2021 MacBook Pro can be upgraded to Ventura macOs 13, Sonoma macOS 14, or the current Sequoia macOS 15.

I would recommend upgrading to the current macOS Sequoia. See: How to upgrade to macOS Sequoia - Apple Support

To upgrade to earlier macOS versions, see: How to download and install macOS - Apple Support

Be sure to have a current backup (always a good idea even when not doing an upgrade).

Not sure your question is clear. If you are asking if all your software will run if you upgrade, there's no way to know without knowing what software you have installed.