Differences between open-source software supported by the community and open-source software supported by commercial companies

I have completely completed the service today, but I do not have any official MySQL documentation. There are a lot of Apache and PHP, not to mention Linux. Therefore, Oracle is attracting more people to participate in their training in this way. Therefore, it is not a good thing for a good commercial software to be controlled by a profit-making business company.

Another problem I don't understand is that some people say that Gentoo compiled from scratch is not faster than arch, and some people have to compile the pile of software themselves when building the lamp environment, it can improve performance. Who is right and who is wrong?

My archlinux depends on MySQL after installing the graphical environment, while MySQL does not coordinate when building the lamp environment. The configuration file cannot be found, which is far from the online saying...

It's really intolerable.

In addition, most of the books found in the library are in the Windows environment, which makes me speechless. Although this can reduce the threshold, since these things are designed for * nix, what about Linux?