I have had more finger issues than a p0rn stars had throbbing shafts, mine have all healed up every time some take a month others take best part of a year. My ring fingers used to tweak all the time but I have not tweaked either in a year (touch wood) it's my middle fingers that go now..Unless you full rupture your body will heal it's just how well you deal with the he stress/annoyance of being out injured, I find this part the hardest and has almost convinced me to quit a few times. Careful use of holds is good advice as well as being aware of your body I.e if you're tired, not warmed up etc
Obviously you'll want to re introduce small holds at some point
None, your tendons get stronger and you learn to identify and avoid potentially injurious situations.The frequency of my pulley tweaks have decreased over the years, despite my climbing slanting more and more towards bouldering and training. (campusing, weighted hangs, repeaters, steep boards etc)I don't think I've had a tweek in the last 15 years.