Setup of the new server

Found a useful article on how to set up your own mail server. This is important to me - without such hints, setting up the server takes about twenty-four hours and with the instructions this can be completed in just a day. If not for some minor mistakes in the article, it could have been done even faster. After some time, the antivirus that I have installed according this article was uninstalled - this thing eats away almost a quarter of the RAM, which is slightly critical to me.

On the same site you can find of how to configure Apache, PHP and MySQL. I can not say that this information is very necessary - you can install them without such instruction, but with instruction it is easier.

The OpenVPN can be configured here according to this instruction. In my opinion, OpenVPN should be configured by every self-respecting specialist.

What useful links and instructions do you have?