Merging websites

[Nomad]

Have you ever merged two or more websites, what was your experience like, did the merge go well? Well, I have tried merging wordpress websites many times and I never have had any major issues. In fact with wordpress, you have so many options to merge but the simple one is by using a plugin that allows you to import all website files. I have not merged websites running on other software and I am trying to learn how to do it.