OK, I have read Volume I [200 pages ugh]. Did the Trump campaign collude with the Russians?
Remember: Collude: to cooperate in a secret or unlawful way in order to deceive or gain an advantage over others.
See pages 185-188 of Volume I of the report, which makes it clear that the Trump campaign tried to collude, and also makes it clear why Mueller et al. chose not to prosecute under available statutes.
[spoiler alert: Don Jr. was too dumb to know that what he was doing was illegal.]