Deep Rock Galactic tips and tricks?

One, play on difficulty one or two - there's no shame

Two, go to the Steam guides and look up some general builds - it's easy to make suboptimal builds.

Three, and this might go to show how much I've played based on this being "earlier" but you can do promotion missions as any dwarf, not just the one being promoted.

All that said, what's overwhelming you? What class are you playing and what missions? I like scout for the maneuverability and it makes short work of high complexity caves but driller is easy mode for refinery missions.

Oh, yeah, "Complexity" and "Length" are two metrics for each mission and are independent from difficulty. A three mark complexity cave should be avoided until you're comfortable with the live map.

Rock and stone!

Others here have mentioned the difficulty. I spent a loooong time playing Haz 2 missions before going to Haz 3, and I pretty much consistently play Haz 4 these days. Haz 2 is good for learning game mechanics, as there's just enough pressure from the bugs that you can't just be idle, but not too much to overwhelm.

When I've brought new dwarves into the fold there's an order in which I introduce new ideas to them.

• Assignments. The terminal is near the map selector and the ramp to the drop pod. The first few assignments are good at showing you what the mission types are, and you should pretty much always have an assignment selected.
• Gameplay. To start, just focus on core gameplay. Mining resources, traversing with your selected dwarf (each has a niche), shooting bugs, and finding the dirt walls. That last one is a very useful skill to have.
• Classes. After a few rounds, try switch it up. The game encourages you to play multiple classes eventually. Scout zips around, Gunner can protect key locations like resupplies and reviving teammates, Engineer is good at area denial (and later on out guns the Gunner), and Driller drills and commits war crimes.
• The weapons terminal. You'll be spending a lot of time trying things out. Buy some upgrades for your weapons, see how they play, then try something else.
• Assignments pt. 2. You should have assignments to unlock new weapons by now. Each weapon is unique and fits into the game in its own way. You'll also have assignments to unlock other terminals, so do those too.
• Gameplay pt. 2. You'll be more familiar with the game now, just keep going at it. Try Haz 3, it'll be a handful compared to earlier hazard levels, but it's not unfair. If you're coming out of most Haz 3 missions alive, stick with it.
• Leveling. You might've noticed there are two leveling systems: red and blue. You get XP every mission (unrelated to the season XP) and this fills up the red level meter. Every red level gives you a segment on the blue level indicator (hexagon top left). Three segments and you get a blue level. Red levels go up to 25 for each dwarf, whereas the blue level is shared for your entire character.
• Assignments pt. 3. When a dwarf reaches red level 25, playing them is not going to get you anything. It's at this point you will have a promotion assignment. Completing the promotion assignment and going to the promotion terminal in the Memorial Hall will reset the red level of that dwarf to 0 and give you a nice shiny star. You will keep your upgrades, so don't be afraid. You will be doing this often.
• Matrix cores. Matrix cores are used to unlock overclocks, which are a new type of upgrade for your weapons. They range from stat motifications to outright mechanical changes that completely change how you play the game. You'll earn blank cores from doing the weekly core hunt assignment and deep dives (which you'll have just unlocked). These can be turned into specific cores by completing events in missions. You'll definitely have seen them. Insert the key, do the objective, place blank cores, select a thing. Then back in the space rig, go to the forge and make that core into an overclock.
• Deep dives. These are 3 missions in a row with resources shared between the missions. These change weekly and are seeded, so they're the same every time you do one for that week. Completing it for the first time that week will give you more matrix cores.
• Seasonal content. Don't start caring about it too much until this point. You can go back and play any of the past seasons at any time, and your progress will be saved if you switch out of it.

Good luck out there, miner! You'll need it.

Play engineer imo! He feels simpler than the other classes because you can kinda just babysit your turret and put platforms everywhere for the youngins to zip around to. I always liked playing him because of that.

Make sure the kids aren't making you play on really hard difficulties too, start on low hazard and work your way up, the easy difficulties are a great way to get used to the game because it's really hard to lose

Echoing the other sentiments - start at the low hazard levels and don't increase it until it feels easy.

Other tips:
*always be looking around. Many of the enemies are very quiet when moving around.
*I recommend playing the gunner. Gunner is pretty straightforward in terms of game play. You shoot, you use your shield to guard against waves and provide a safe spot to revive your teammates, and use ziplines to get access to areas. Plus, with the minigun you don't have to worry about reloading.
*when a wave hits, always keep moving. It's harder to hit your targets, but since most of the glyphids are melee based you can minimize damage by keeping a healthy distance.