-dont panic when serpents fly at you...I just stop moving and try to time my swings so I can knock it back without taking any damage (easier said than done as the hit detection seems a little wonky sometimes)
-whenever I can, I try to get underneath monsters, as (to me) it seems easier and more consistent to gauge the reach of your sword and keep from getting hit when youre swinging up - happens all the time where im trying to swing to the side and my mouse will be too high or low and cause me to swing upwards or downwards, miss, and take damage. Also, the reach feels a lot shorter when swinging in the down direction, could just be me though...
-and yes, bombs. Bombing a big cluster of rocks almost always reveals a ladder or shaft. Careful with mega bombs though, not always easy to get out of the blast radius