[Christ]

You do not put the transmission into reverse until you're stopped. Reverse gear is straight cut, and does not have a synchronizer. YOU WILL GRIND at any speed, potentially.

Being in a hurry is just a bad excuse for not coming to a complete stop.

And how exactly did you manage to burn the clutch because you shifted into reverse too early? The two events are not related, by far. You burned the clutch because you were leaving it partly engaged and overheated it revving the engine. You heard the unpleasant noise because you attempted to engage a gear moving in the opposite direction of your vehicle while the vehicle was still in motion.

I suggest you learn a little bit longer on a junker before buying any other manual car. Patience is key in a manual, and the key is to shift slowly and deliberately, not slam it into gear like a ricer.