Keep linux software and Kernel up to date

Question

How can one keep linux software & Kernel up to date?

Answer 1

1. Employ yum update or up2date

2. some of the distros apt-get update

3. Security essentials such as selinux

4. password authentication such as password aging, limiting to user previous passphrases, and locking user accounts after login failures.

5. Disable unwanted services by using chkconfig --list | grep "3:on"