Multisite MODX Revo actual implementation?

Question

MODX

Can anyone give up-to-date instructions for the option with different domains, based on the office. documentation
for ispmanager eg. we add 2 domains (Vasya and Petya), we indicate Vasya
with Petya's alias, we put modx in the folder with Petya, we add a context for Vasya, then I don’t understand what context settings and where to implement. And most importantly, how does multisite affect indexing by search engines and site loading speed?