4/ What does the percentage stands for when you're targeting? It seems like a chance to hit, but then another dice roll seem to happen afterwards.
Is there a way to have a condensed vision of the DnD rules somewhere because although I do understand most of what happens, the fights feels very weird to me, having pretty much 1 hit out of 4 that actually deals damage, and that deals around 25 to 50% of HP of the target. At this point it feels more like a lottery than an actual strategic game. I won't even go on the fire surface on damage, although I do get that walking through fire shouldn't be a breeze, it's a bit more punitive than D:OS 2.
So again, am I missing something or is it just the way DnD is intended to play?
others seem to be answered really well.
In order to hit a target you have to match their AC or get higher then it. The percent throws off alot of people, what happens basically is you roll a d20 add your modifiers if that equals or is greater then your targets AC you hit, if not you 'miss' basically it's like the above dex saving throwing.
so if your target has an AC of 15 your using a strength weapon (one that doesn't have finesse in it's description those use dex) and your strength modifier is +3 and your proficiency is +2 you only need to roll a 10 in order to hit. At times this can be a real pain in the ass, if for some reason the computer is rolling low. or if your playing pnp your rolling shit. Add to this if you have advantage your rolling 2d20 and taking the higher number. With disadvantage your rolling 2d20 and taking the lower number. You can usually tell if you have advantage or disadvantage if you hover over the enemy and a box shows up on the left side of the screen with an arrow pointing up with like backstab next to it indicates advantage, if the arrow is pointing down it's disadvantage.
Also they are color coded as my roomie pointed out green is advantage, red is disadvantage. Oh yeah way to help us color blind people out!!! Whoooohooooo! most common form of color blindness is red/green and yet devs still making shit red/green. How about green blue? red, blue? You know for us people whose brain mistakes one for the other, or can't seperate them!! RAWR!!! okay most of that was a joke, since there are games with supposed color blind assist, not for sure if this one has it though.