Engage the Community
Evo is a free, Open Source software, which was originally created by "MODX Technologies, LLC.", since 2014 it has been maintained by a global Community of developers.
While the fastest way to get help is via commercial support from one of the Evo development team, there are other professionals that can provide help
There are numerous resources for learning Evo and as such, the best place to start is by reading the documentation.
If you do need technical help, your first "port of call" should be the Forum or if you wish to report a bug vist GitHub.