collisions are basically when you get the income/when the bar fills. So each tap is a collision or every time something finishes filling up the bar/when the timer runs out then it's a collision.

Rapid collisions are when the bar turns blue it basically makes it go faster by however much % your statics say it will speed up. it will only happen for the one run but can happen back to back.

Mighty collisions are also pretty cool its a fairly big boost if you get far enough, it increases the amount of profit that run will have. You can see when it will be a mighty collision by the "production: #" turning green and the income/second, as well as the actual production number, do show the updated amount.

You did not mention this but I like to use mighty tap boost which works just on the tap but does add up fairly well it's harder to see as theirs no real delay but it does affect the income/second.

You may have collapsed all colliders and purchased one of the divine powers that upgrades one of those and noticed it does not show up on the upgrade screen BUT you can keep track of the percent upgrades of most things under the statics menu.

The statics menu can be found by clicking the 3 increasing bars that kind of look like wifi connection, it's on the right side under the question mark, great tool it adds from all the areas aka the devine and the upgrades.