A lot of the Reddit stuff is out of date. Painite got nerfed years ago. It's a shame they don't do housekeeping there to get rid of the stuff that's been superseded by new technology, new knowledge and latest gameplay. There's a lot of good stuff there, but if you don't know about everything, you can't tell what's right or wrong. I cringe when I look at the beginner stuff, and I'd judge that whoever wrote about RES mining has never actually done it. They say you need an SLF and weapons. I do it in a shieldless unengineered Type 6 with no problems at all. Look at the Anaconda in the linked thread. This one would mine at literally double the speed with twice as many lasers and twice as many collectors.
https://s.orbis.zone/qKIV
To answer the question about RES mining. If you have a choice of location, RES mining should always be first choice, since you get extra stuff with very little downside. Also, you don't need a DSS, which releases a slot for something else. It's not really much different to mining anywhere else. You don't need weapons and you don't need to shoot anything, which only wastes time.
Haz RES should be the most dangerous, but actually it isn't any more so than anywhere else. You drop into the RES, fly out to 16km, wait for any following pirates to scan you, then start mining. Other pirates come about every 30 minutes on average. In a medium ship, like Python or T8, you'll have filled up before any come most times. In a bigger ship, when the pirates come, just give them what they ask for. There's plenty for everybody to share, and they don't ask for much. Alternatively, if you have a ship that can do around 500m/s boost, you can do about 3 or 4 boosts to run them off the radar and carry on mining. That also works if you can't figure out what they want and they start shooting you. It helps a lot to have good shields because if you're unsure of what they want and they start shooting, you can carry on mining until they say, "all this can stop if you give me....", then you can give it to them and they'll stop shooting after a bit.
You mine in a band 16km to 20km from the centre because there are fewer pirates the further out you are, but you get no RES bonus beyond 20km. That means you go round in a big circle. To stop yourself from getting disorientated and going back in the direction you've already mined, you take note of the sky. One half has the yellow Milky Way and the other has black sky with stars. You should try to keep your wings in the plane of the rocks and try not to roll, so that you don't get disorientated, then keep the yellow sky above you. Use your lateral thrusters a lot to stay level. Finally, when you're at 17.5km, put the RES marker on the left side of the mini radar right on the edge, which points your ship at a tangent to the 17.5km circle. If the dot on the mini radar is hollow, you're going away from the centre and if it's solid, you're going inwards. That's how you navigate to stay in the band.
If you're mining platinum for money, it's worth also picking up say samarium, to give to the pirates when they don't specify what type of cargo they want. When you fill up with platinum, you can dump any samarium you have at the last couple of rocks. That won't help if you're mining for PP merits.
Haz RES mining is much more entertaining than normal mining. It's great when the pirates start arguing over who gets the cargo you dumped. When they all make demands together, like say one wants 20T of platinum, one wants 10T of anything and another wants 935,381cr worth of cargo, 20T of platinum will cover all of them. That's when they start fighting over it and leave you alone while you're mining.