Mobility being key to making the most of the bazooka, you're going to be rocket jumping a lot.
Even with all the bells and whistles the bazooka introduces, you're still going to be relying on single-rocket jumps a lot, especially when running away combat, where you often don't have time to load more than one rocket before you get turned into swiss cheese by a heavy that was revving up just around the corner.
As you probably know, when you load more than 3 rockets into the chamber of the bazooka, you get a misfire, which you can use the same way you'd use a rocket's explosion to jump off of. As you can imagine, being able to jump on an enemy and then still have another two rockets ready to shoot immediately is damn useful. You can also continue to load rockets into the gun to keep chaining overloads, which can allow you to traverse large distances, or skip parts of a jump map you don't wanna bother with--but nobody would ever try to cheese on jump maps, right? :P
Easily one of the bazooka's bread and butter jumps: you load 2 rockets, shoot one behind yourself then one in front. The timing and angle can be a bit tricky to figure out at first, but once you get the hang of it, it quickly becomes automatic. This gives you a ton of speed quickly, so it's incredibly useful for getting around and snatching medkits/ammo. You can also do it, which can give you a more speed and/or height, depending on how you angle the rockets; if you're going for height, the last two rockets should be more like a sync than a pogo.
Misfire rocket #3, use the remaining 2 to do a burst pogo and launch yourself across whatever map you're on at massive speed.
Load 2, shoot one at the ground and one at the wall.