IMO - it's worth your (and anyone else who plans on voting's time.) If you want to deep dive you can, but the executive summaries of each only takes about 10 minutes to read in each of the two volumes and it answers your questions or at least where you're fuzzy.
Vol. I is about Russia and firmly establishes the campaign tried to contact AND use information from Russia. What saves the Trump camp on this, is that every time that channel attempted something, either a meeting didn't happen or the promised payoff wasn't there. A payoff happened, just never the one explicitly asked. Hence there is no Conspiracy charge, which is the only statute applicable. But it also firmly establishes that Russia is actively working and attempting to deliver on things Trump said publicly. Herein is the constitutional problem - by requesting in a vague sense and in public and the other side acting, there isn't a law against it. So as you or I may very well realize this is a bad, bad, thing for a Republic (unless we want Dems and Republicans forming international "understandings"). By Congress doing nothing, as long as the Quid Pro Quo doesn't "match up" properly (which would break the law), foreign governments can actively and legally seek to install candidates. So in this sense it's up to Congress to determine what "Collusion" is - because what I've just described makes a mockery of Article I, Section 9 (Emoluments) and skates in an uncomfortable intepretation of Article II, Section 4 (bribery, treason, and other high crimes and misdemeanors).
VolII is more clear cut. He is in violation of statute and Mueller makes no recommendation and remands to congress. Here, Trump attempts to obstruct justice multiple times. Again, his saving grace is his subordinates, being smarter than him, either refuse or resign. His Comey firing's intent is obvious. He has violated these laws (well, in so much as you would prosecute and let a peer of juries determine the supporting facts).
But again - this is the problem. Every Senator has probably read this document and THIS is what Mitch is saying publicly and what Barr skipped over. So again, there's no upside to even trying to impeach EXCEPT for the theater. We'd need 13 Republicans to "defect" (or as I'd call it, do their f'ing job) and it's just not a calculus I think any Democrat looks at and goes - yea, THAT's a good idea.
By all means they should investigate, but my take away from this is you're going to have to amend the constitution to be more specific regarding Article 2 Sec. 4. And we need to start addressing the elephant (puns!) in the room of political radicalization in this country. I'm not sure if that's amending Amendment 1 or bringing back equal time laws, but if we need prima facia evidence these pockets of insular/conspiratorial thought are caustic to the constitution, it's playing out in prime time right now.
BTW - to your point in the other thread that is "payback", etc. I don't necessarily disagree. But that's being compounded by the rhetorical silos that have been built. When a government fails to function (pass laws, execute them, and maintain rule of law), humans revert to... well, lesser instincts. Antifa, Proud Boys, et. al are a symptom of the problem. But the only group that can "fix" the problem right now are the Republican Party - they're holding the cards and they're not interested. The conspiratorial entrepreneurship, the winner take all behavior - it's despotic behavior and it's conditioning that electorate to not only tolerate, but protect out in the open criminality.
That's my frustration. I CAN'T speak as a Republican to fix it. I CAN point to the constitution and say what is going on right now is not in it's spirit and it's arguable that it was ever a Republican value prior to 1990. Transgender Athletes, liberal colleges - these are the side show.
Redacted Report:
https://www.justice.gov/storage/report.pdf