Only do I can put Invoke methods into the PROCESS.XAML?

Good afternoon guys, a lot of time without any post, and blessing to all for the current situation in the world, now I need this question because in this moment I need to explain to my trainees if possible put another activity apart to Invoke Methods, I was though in “IF” statement, but I have the only knowledge that the PROCESS, is only to putting all the invoke methods. I need your help to amplify my concepts. Thanks

@efrain.caceres - Invoke Method activity can be added in any of the .xaml (sequence/flowchart file)

Then, what is the real function of PROCESS?