Curiously Deep Rock Galactic is about practical knowhow. At least that differentiates greenbeards from greybeards.

• The oppressor is nearly immune to bullets but melee attacks are super effective
• The Driller will overheat digging about 12 meters (depending on the upgrades used) Digging ten clicks then pausing to cool will prevent overheat
• Cave leeches make a distinct yummy noise before attacking. You can escape by seeking cover again. Cave leech attacks are often facilitated by a distraction such as minerals or glyphid ambushes
• The Scout's grappling hook does not account for safe perch or landing. Scouting to a sheer cliff is a good way to just get hurt. Mind where you're going to land.
• On the other hand minerals embedded in a cliff face often protrude enough to get purchase. This can be facilitated with a flying pickax attack. Practice, practice!
• Likewise, dwarves can scamper up steep slopes like mountain goats with forward movement and spamming jump.
• Then again, gravity is the number one killer of dwarves, seconded by common Glyphid Grunts. Don't underestimate them.
• The Driller's Collette Wave Cooker can defuse unfuzed Exploders when it deals the killing damage (defuse = doesn't explode). The Driller's Cryo Cannon can defuse fuzing Exploders...sometimes.
• Overhanging cliff-sides are the nemesis to the Engineer's platforms. If you dont want to carve out headroom, extend them out a layer or two.
• The Engineer / Scout team (platforms and grappling hooks) can quickly exploit the high-positioned minerals in a cave.
• That said, platforms can make for great bridges. Do so at whimsy for starters and learn where it's useful.
• And yet, the engineer has the most trouble traversing sheer incline, especially in tight quarters. Make sure your Engie can get to the drop-pod safely.
• Speaking of extraction, Simple Mining missions are the most linear and require the most attention regarding preparing traversal back to the droppod. Escort is also linear but naturally comes with a big tunnel which makes it easy (when Dotty doesn't carve a vertical drop). Other missions feature a rounder, unlinear complex and a shorter exfiltration. Sometimes the pod will drop onto a crap place, with the ramp in mid air, or embedded in hard rock.
• Drillers should watch for adjacent chambers to connect by tunnel. Engineers should bridge chasms and seal holes. Engies can also create safe steps to traverse hot slag and slime. Both can level out arenas where fights are expected (say when prepping for a dreadnought or powering up a salvaged drop-pod)
• In escort the Engineer's grenades make short work of rocks and beamers. (The latter needs something that chips into rock, even a scout with a pickaxe power attack). The Gunner's hurricane rocket launcher manages both nicely.
• Dotty, Hack-C, Steeve, lootbugs, Hexawings, Breathers, Cave Vines can all be petted and should be. Bosco can be saluted. Using the laser pointer, other Dwarves can be talked to.

These are all off the top of my head. There are dozens of others one learns on the path to Greybeard enlightenment. Rock and Stone.