Came here to post this one. I intentionally tried to train myself to do this about 10 years ago and the muscle memory came a lot quicker than I expected. It's a very secure knot and the sides hang to the side, not wonky like the ones most of us learned.
Powder, from any company that you find reputable. I like the micronized form. I would avoid any of the gummies, as a huge percentage of them have nowhere near the amount of creatine they claim (I believe the cooking process denatures it or something but this is just conjecture).
HL's engine GoldDrc was originally a mod for Quake. Team Fortress Classic was based on a quake mod. Counterstrike was a HL mod they bought out. Portal was a student game they bought. Dota 2 was based on a WC3 map. Left 4 Dead was a mod made by Turtle Rock while working on CS:CZ (so, yet again a mod, although a mod based on their own engine this time and build in house). Underlords was based on a Dota 2 mod.
Deadlock is original, but based on characters and lore from the game they made from the WC3 map.
Deadlock and L4D are arguably the only true original creations.
Valve knows their bread is buttered by outside creation using tools and platforms they can provide and then fold in if it catches their attention.
Every other iteration of a service that introduces a free ad-paid tier then ratchets it to bifurcation of premium in to 'premium' and 'premium with no ads' and then on and on.