I gave it a quick scan and I can see what Kangaroo means. Your organization for the when to roll hider is messy. You should first give an explanation of what the rolling syntax means for people who have no idea (like say Xd6 means to roll X number of 6 sided dice, the + stat means to add whatever modifier you have on that stat AFTER the dice roll [I've seen people be confused and think such things meant to add dice], and that's how you get the final number; also wouldn't hurt to give an example or two using stats from your example character), then make each result explanation its own line rather than having it clumped into one paragraph. It looks messy with things smushed together, and it's hard to follow in some places, so using line breaks would clear that up. Also you should probably state what happens for <7 rolls for those actions, because it seems that there ought to be some negative repercussions for shit rolls if melee attack rolls of 7-9 mean they also get hit by the enemy, for example.

Generally that whole hider just needs a major overhaul for grammar and clarity. Putting each result section on its own line will help that a lot, but you've also got things like the ranged damage explanation for 7-9 rolls being a really broken run-on sentence that should be separated by a semicolon or split into two sentences. General revisions for grammar in the rest of the guide could also do you some good. Aside from that, try to keep in mind that you want everything as simple as possible so everyone understands it, because if people are confused by things they're much less likely to actually join your game. Act like you're trying to explain everything to a 13 year old who has never even heard of tabletop RPGs and you'll end up with zero confusion if you do a good job of it.