You can get more information about the CentOS distributions, such as installing, configuration best practices, and so on at https://www.centos.org.
The following website gives you a lot of useful tips and best practices from users in the Linux community, particularly for the Debian distributions, such as Ubuntu: https://askubuntu.com.
The following link gives you information in general that relates to various commands that work on both CentOS and Ubuntu. You can post your questions at the following link and other community members will respond: https://www.linuxquestions.org.