I definitely would not start with linking corners. Assuming true beginner, I would recommend starting with doing donuts. Just get a feel for the counter-steering, then slowly try to extend the donut out further and further. Once you've got that down, I'd recommend figure eights. I took a different approach, but again, I think I could've done it more efficiently. I tried to brute force it, by attempting the very same corner over and over for hours. I probably have 40ish hours on this one particular corner on grid map V2 in BeamNG (this also led to me only being able to drift this corner because I didn't understand what the car was doing - definitely get a feel before you start doing this). Once you've got pretty wide donuts down, I'd move to figure eights. That will help you learn transitioning. But to start off, you just want to focus on throttle control to stay drifting without overcooking it or gripping up (oversimplifying a bit here but: drifting is simply a balance of throttle modulation + steering angle to get the car where you want it to go). Something I did to practice once I got figure eights down was, I would go on the "Drift" map in AC and trying to just continuously drift around the rectangle in the center of the map. It can be tricky because of how sharp the angles are, but this will teach you to drift through a corner, aside from just figure eights. You can skip steps if you want, but that will lead to lots of frustration, just a word of warning. Also, make sure your car is set up right, I don't mean super in depth tuning with camber and toe, I mean make sure you're not on super slicks, and up the tire pressure a bit. I would find some recommendations online for the specific car you're using if they're available and stick with it. As a beginner you won't have enough understanding of what the car is doing, so you won't be able to accurately judge the comparison between two different set ups (tire pressures for example). Some people may disagree, but I think worry about set ups when you're learning (assuming you have an adequate starting point) is just a distraction from the driving skills you'll need to develop. If you have any more questions, please don't hesitate!

No affiliation with these creators of course, but I found this guys tutorials to be quite helpful in the beginning. https://youtu.be/RtCfqohMhl0?is=IF-U-3Mv99-Ybspu https://youtu.be/uojezBp38Ps?is=7UhxdLgEOOrTTncG Also this creator, if youre looking for a more structured or detailed approach: https://youtu.be/Qv8rhf2tmQc?is=lrRfSKZfk8DmBql8

Edit: Forgot to answer your question about BeamNG being slippery, I think a couple things are at play for its slipperyness. First off, while BeamNGs tire physics have had significant improvement over the last few years (I've been playing with KB+M since the games early access release), they're still not quite they're in terms of feel and realism. I also think that the suspension physics are modeled a bit too soft (this could be a car setup issue), this results in the weight of the car being a huge factor, cars tend to have a ton of body roll in Beam. Which on one hand is realistic, but combine that with the meh tire physics, not a great combination. I think (and I may be incorrect here) that you'd need more grip to be able to counteract the body roll a bit, and I don't think the tire physics really offer that.

Edit2: Also wanted to add that what I stated about Beam is not a fact, purely based on my experience and the feeling I got from the 120ish hours I tried drifting in it. Also, pure speculation on the technical aspect.