they're the only dungeons caves and holes i find fun in this game because i dont have to relaod constantly if i get shot at and i dont see where the arrow goes / ash piles thousands of them / picking up useless weapons just to drop them all on 1 corpse just to keep save file bloat to minimum

recently went into some darksut cave or something all it was was trolls and i was happy and was cool + now all i need is a heart to continue along a quest in an orcish fort i found

http://www.uesp.net/wiki/Skyrim:Places list of places gives the enemies found in many of them.

I'm not sure what you're asking. Sightless Pit doesn't have any of the enemies you mention - Falmer, but none mentioned in the title.

If you need a Daedra Heart there should be 4 Dremora at the Shrine of Mehrunes Dagon if you've completed Pieces of the Past, there's 1 in Kodlak's quarters in Jorvaskr (may have to steal it depending upon where you are in the Companion's questline), Enthir (College of Winterhold) sells them consistently if you've done Under Saarthal, and alchemy shops sell them sporadically.

That's pretty much all of the enemy types except Falmer, Dwemer, and Animal.

falmer show up in dwemer ruins easily avoided

I hunt giants spiders trolls and other such creatures .-.(mostly giants)

Falmer are not always in dwemer ruins.. your wrong...

He didn't say that they did...just that they were easily avoided.

I recently went to a cave where it was bears bears and more bears. Just bears. I've seen bear caves with 3-4 bears before, but this had like 15 bears. I can't remember where it was.

that woulda been a nice place to set up camp .-. possibly