Currently we have the version 2.200 installed and we want to upgrade it. I want to know what is the best way to do it. what are the possible flaws. and how often the jenkins should be upgraded. Thank you
Read my prior advice.
In upgrading, I'd suggest take the latest release of each LTS in sequence (2.204.6 / 2.222.4 / 2.235.5, etc). You could chance skipping one if no significant changes.
Best to not fall more than 2 LTS behind. use a backup instance to upgrade and validate every bump.