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Both Debian and CentOS (as do most other distro's) have this system already in place. Depending on how you configure these tools updating/"patching" can be done automatically or a notification can be shown (and you decide which is implemented and when).
If you do want to be notified about security related patches, you can describe yourself to the appropriate mailing list(s) and check out the appropriate security page(s). Here's a Debian example:
but i am wondering, if patch management done through updates so is it really require tools for patch management?
I don't think you need any other patch management then the one that is present on your distro.
second thing is, security update gives only security related patches or any other patches also?
These security advisory sites/mailing lists are security specific.
I know for sure that Debian has 2 settings that you can use: security updates and "other" updates. Make sure the first one is up and running (maybe even with an automated install, but this is a personal choice). Check the second one every so often to see if anything interesting is present.
I'm guessing that other distro's have something similar.