Improve the site on Modx and Webasist

Please answer the questions immediately, so as not to waste your time and mine.
1) What improvements have previously been performed on this technology?
2) What were the most difficult works performed at the frondeend?
3) What were the most difficult works performed on the backend?
4) What other CMS have experience and what kind of experience?
5) Do you have experience with git? If so, then:
5.1) Which Git commands did you use?
5.2) What are the experiences of conflict resolution?
5.3) What is the experience of working in a team with a git, how do you pour refinements through the git to the fight?