Key to remember in PVZ is you can (and must) do eco damage without doing actual damage. Just forcing army early game prevents them from droning unchecked up to 4 base saturation. Unlike toss every army unit they make is one less worker. Twilight openers are very strong since zerg has to respect your early push by making roaches or banes or else they take lethal damage. Harstem has a good opening you can practice on his youtube called the $65,000 build.
If you take this style the game runs in three phases.
Phase 1- Adept Opening - Try to hit with 8-12 adepts between 4:30 and 5 min. Practice keeping up probe production, taking a third, and getting immortals out during the attack. Helps to post a probe at your third right before the attack so you can quickly pop back and start the third between rounds of shading. Don’t feel like you have to kill too many drones, forcing roaches is good enough, but if you get a good shade feel free to commit.
Phase 2 - Take third and prepare an immortal sentry push. As soon as the adepts back off, warp in a round of sentries to start banking energy, get blink (chrono), plus 1 weapons (chrono), extra gates, and saturate your third. The immortals and sentries you made should keep you safe from a roach counter which is the most common way to die, if you’re getting killed by that you missed immortal production during the attack, keep practicing. Try to hit a timing of sentry immortal blink stalker when the upgrades are done. Use an occasional hallucination to scout for a tech switch from the zerg, blink should keep you safe from mutas, if you see muta make stalkers and surround your base with observers. Goal of the push is to force more army, maybe kill a base, potentially end the game.
Phase 3 - take a 4th and start Templar archives + Storm + weapons 2 around the time you push. If the attack isn’t going to kill the opponent poke a few times to scare them into over making army and then back off. Go into 4-5 base macro play with sentry and storm. Drop a stargate for the skytoss transition and start 3 weapon upgrades plus 1 air weapons.
To practice, the adept opening should be identical each game so just practice the first 5 mins over and over again against easy A.I. Phase 2 and 3 depend on the effectiveness of your opponents response. In gold almost all your games will end in phase 1, by diamond players will defend but often over respond leaving you with an eco lead into the mid game.