Is this existing where you are adding lights or is this a whole new install? If it's an existing install, all you have to do is take down a fixture and add more to it. Don't take all of the wires apart that are in the box, just the wires that are connected to the fixture and pay attention to what you are doing. I've had many service calls where the homeowner decided to do it himself, took all of the wires in the box apart and had no clue how to put it back together.
If you are adding a new circuit, don't overcomplicate it. The easiest way to do it is to take a 14/2 (hot, neutral, and ground) to a switch box. Then run a 14/3 (two travelers, neutral, and ground) to the second switch. From the second switch, run a 14/2 (switched led, neutral, and ground) to the first light, then from light to light to light until you have all of the lights connected. At the switched, wire nut or Wago the neutrals together and shove them to the back of the box, you don't need them any longer as all you are doing is carrying the neutral through the switch boxes to get to the lights. The black wire from the 14/2 will go to the black screw on the switch, and the black and red from the 14/3 will go to the brass colored screws, and it won't matter which wire goes to which screw.
There are other a few other ways to do it, but this is by far the easiest.
If you want to use a 20 amp circuit, use 12 gauge wire instead of 14.
