"But the way, Reaper accepts most VST and VSTI plugings, whereas Audacity is very limmited on that regard."

True.  But Audacity does a much better job of stealing and selling your pesonal data!  😏😆

Reaper is, as equator stated a very good DAW.  There may be better, more powerful ones.  There probably are.  No, I'm sure there are more powerful ones.  

But! 

1) For 98.7% of the requirements of us newbies getting started with digital recording, Reaper will serve.

2) A more powerful DAW, to fulfill that 1.3% of the stuff that we will never need, is going to cost multiples of what Reaper costs.  I think Reaper now costs something like $60.  It is embarrasingly cheap compared to the more powerful ones.  Not only that, you don't need to pay for it until you have tried it!  I can't remember how long the trial is.  3 months?

3) Any DAW is going to have a huge learning curve.  Reaper is no different.  But Reaper has hundreds of teaching videos on their website.  And, Reaper has a really friendly, helpful forum, also on their site, that will help you with any question you have.  They even have a subforum caalled "Newbieland", the purpose of which is self-evident.  They have cheerfully answerred many of my very dumb questions.

It will be very difficult to go wrong with Reaper.