Start with Hubitat Package Manager (HPM), which makes installing/updating many of the popular third-party integrations into a simple search/click task:
https://community.hubitat.com/t/beta-hubitat-package-manager/38016
If they handed out Nobel Prizes for HA packages, @dman2306 would surely get my vote for HPM! For many HE users, it could be the only package that they ever need to install using HE's "Apps Code" editor thingy.....
