More than we could ever write about is written in the Mueller report so no need to spend too much finger energy on it.
1. "Collusion" is only a crime when monopolies conspire to price fix or put other companies out of business as AWS, Apple, Twitter, Facebook, and several others did earlier this year to put Parler out of business.
2. The Mueller investigation looked long and hard for an actual crime and found none. There were people with a lot of opinions. I think Biden benefits from his family's dealings with China. Can we impeach him because I believe that? No. So far, we have lots of proof (most from Hunter's laptop, the rest from first party witnesses who participated in the shakedowns) but we don't have the money trail. Thinking Trump is guilty of the non-crime of "collusion" doesn't mean he or his team committed any crime. Mueller never investigated the FISA applications, which were based on lies because he didn't want to know that the whole premise of the accusations was built on sand. Sand paid for by the Hillary people, BTW. So did she collude with the Russians to smear Trump? I think so based on what I've read of the evidence.
3. The prosecutions of Trump supporters were for process "crimes" which the corrupt FBI and DOJ elected to not prosecute Democrats for.
Just FYI, it is common practice for the incoming administration to talk with our "allies" prior to taking over. John Kerry continued to talk to the Iranians AFTER Obama left office. That was technically a crime. The Clinton Foundation took money from foreign donors while Hillary was SofS. What were those people paying for? Funny how the donations stopped once she lost the election. I guess the foundation wasn't actually a charity after all.