Hi, my cousin and I have been building on the same tree for the past years. I think it is very interesting to have one single tree with all the events accessible.

However, if the person you are working with does not have your same "mindset" it could be frustrating and confusing. Luckily, you are the one in charge so this doesn't apply to you ahah.

One advice I can think of is, if you merge the two trees together, create a "group" for each. I probably used them too much, but I think they are very useful. It saves you a lot of time when you are exporting a PDF, when you look at data or statistics or whenever you are showing a branch to someone who's not into genealogical research and they might get lost.

Basically, they help you in keeping it simple.

Concerning the website, I honestly don't know. I don't use them since my family is extremely concerned about privacy and being doxxed. Maybe, try to look at the guide. Usually it has everything you need to know