The database user name and password is part of the actual database server. (Like MariaDB)
That's usually set when the database server is installed, then your server (via the config file),
connects to the database. I don't know much about the MariaDB, so you would have to
search and read how to change the user/password for that.
But as for everything else you want to do, you're on a big journey, like the rest of us.
Reading,searching, more reading, learning, more searching and reading. The knowledge I
have now, (which is not everything), has taken me months of reading and learning, etc.
And I am still doing it (chuckle)
It's all a matter how much you want to learn and how far you want to go. I use google
a lot. (advanced searching) when I am looking for something.
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