Lots of good information in this thread so far. Please let me add:
When starting out, get bullets in the midrange for your gun. 115-124 gr for 9mm, 125-158 for .38 guns, 50-69 for .223, 150-180 for '06, etc. This will help avoid some of the problems pointed out above. These midrange bullets are more forgiving of minor errors. I know this is tough right now with the shortage of ANY components, but bullets that are very short or very long (either inside or outside the case) add unneeded problems to the learning process. Also keep your powder loads in the midrange, a little off there is not usually an issue but could be at the lowest end (squib load) or the upper end (BIG BANG). Start low and work up is always good advise, but don't try to go too low or too high. Be careful about using different types of bullets with the load data...soft lead bullets may lead your bore badly if shot at speeds for jacketed bullets, jacketed bullets may get stuck in the bore with light loads for soft lead bullets, and some jacketed bullets have a different construction that may need special consideration (the old Speer "semijacketed" handgun bullets come to mind; if shot with low power the jacket may stick in the bore, great bullets when used correctly).
I like carbide sizing dies for handguns.
I like the Lee carbide factory crimp dies for handguns. My fail to chamber in semi-autos went to zero after I started using them. I generally seat the bullet and crimp in two different steps. I use extra seating dies set up for my favorite bullets so I don't have to be making adjustments all the time.
I have a universal deprime die that I use on all brass. My first step is to inspect the brass, then deprime before it goes in the cleaner. I handle and inspect the brass/loading process a lot!