I've used RF since the early G3 days (decades), and flown for real for even more decades. I encourage my beginners, as a club instructor, to use it if they can (some can't afford, etc.).

It does an excellent job of replicating the behavior of the aircraft. So much so, that I have modified similar default planes to exactly match my real (dimensions, alignments, weights, etc.) - and even the "bad" characteristics of the real become apparent. I can then modify the sim plane to correct any issues, and then have successfully modified the real the same way - and it resolves the issue. You won't have to do that, if using the same real model as the one in the sim, of course. But it is that accurate.

ALL sims are poor at fully replicating the flying experience - a small flat monitor just can't replicate a real world giant field of view. Virtual Reality gets somewhat closer, but RF is still a bit primitive at that (It works, but is not sharp, slow frame rates, etc.) So the first time you fly for real, the ability to see everything (especially the ground!) all the time, will be disconcerting. As will learning how to fly in relation to runways, landmarks, etc. Expect a moderate amount of additional learning when you fly for real. You will not be making perfect landings the first few/several flights. If used correctly, you won't crash - just won't be "elegant". And there is that "pucker factor" knowing a real crash might be very bad.

It is FANTASTIC for teaching "muscle memory" and apparent control reversal (when right/left seem reversed when the plane is coming at you). It comes into its own if you practice, practice, practice. The end goal: NEVER crash, never overcontrol and have to correct. Your hands just know what to do in any aircraft attitude/direction.
Pick a flying field, and pick a plane in the sim. Always use the same for your practice sessions. Work on perfect maneuvers - turns round, no gain/loss of altitude in turns, straight and level flight. Use of the rudder. Do circles, horizontal figure 8's, yes, even loops and rolls (gotta have fun amid the boring repetition). Yes practice takeoffs and landings a lot, even if the real world will be different. Vary the wind speeds and gusts to learn how to adjust for them. Cut your throttle at a random spot in the sky, and try to glide to a good landing (somewhere - back to the field, if you can). Do it 15 min to 1/2 hr per day.

While individuals vary a lot in how fast they learn to fly, those that were disciplined to practice in the sim fly for real far faster than those that don't. I 've had many that put in the serious sim time that solo in as little as 3 flights, And for some, that is only because I don't believe that a "new guy" can be accomplished so quickly - so I make them go up a time or two extra to make sure. Those without the sim, can take months, especially if they can't get out to fly more than once a week.