The Trump crowd has long claimed that there was "no collusion, " repeatedly in many venues. Somehow the MSM picked up on this screed, and so it is out there that indeed that the Mueller Report declared that there was "no collusion," a phrase that somehow Trump himself long put out there for his followers long before the Mueller Report came out.
But, in fact up front in the Mueller Report they made it clear that they were not investigating "collusion." They only briefly discussed the term, but the bottom line was that there exists no legal definition of this term. The final point in the report was that "collusion" is not even a "term of art" in the legal system Therefore, they simply ignored thereafter in the inquiry.
Bottom line is that there is massive evidence for collusion, that legally undefined form of half-baked cooperation that never got the level of coordination and conspiracy. They were massively colluding, but never ccould get it together to engage in an organized mutually benefiicial operation to influence the election. They were too incompetent to put it together, although they made great efforts to do so, The obvious example was the meeting in Trump Tower in June 2016. The Russsians wanted certain Putin-related cronies exempted from the Magnitsy law, while the Trump people wanted more dirt on HRC than the Russians were willing to give then, although soon after they delivered the goods.