Those are all excellent questions, and I would encourage you to research the subjects in the fine manual that came with your installation, and search the internet.
Reasonable questions for this forum would be a lot more specific - after you have made an attempt (like installing DBI), done basic forensics, and have a specific issue.
Theory is when you know something, but it doesn't work. Practice is when
something works, but you don't know why it works. Programmers combine Theory
and Practice: Nothing works and they don't know why.
-Anonymous
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