Hey guys its WarTankPrime im going to go through some basic openers i like to start off with. Here's a TVZ build that can unfold into full mech or full bio or a great mix of both.
9-Depot
12-Barracks
15-Orbital Command
16-Marine
16-Depot (close off ramp)
17-Marine
18-SCV+mule (save up 400 minerals then get Command Center on lower ground turn into orbital command when finished)
20-Double Gas (When gases finish fully saturate)
20-Bunker (Don't Forget 1 Marine and 1 SCV at a time)
When you have 200 gas get 2 factories 1 with tech lab 1 with reactor. With that u can make siege tanks out of one factory, and Widow mine or hellions out of the other factory, Now You have to scout to see what hes going in order to see if you go full mech to add on more factories or if you go bio heavy, remember start port as soon as you can but get units out of factories when they finish. If you going full mech saturate both gases by 9 minutes if you're going full bio then get both all gases by 11 and expand by 15 minutes.