In Dying Light 2, players have three main resources: daylight, health, and stamina. And while the sun is far out of your control, how much health and stamina you have is relatively easy to change. Dying Light 2 will introduce you to Inhibitors, powerful drugs that fend away infection, early on, but these shots are an essential resource that can be easily found throughout the game. Here's how you can find more Inhibitors in Dying Light 2.
Once you reach the cache you'll probably have to fight off some zombies, but it's a small price to pay for the essential resource. Just be sure to keep a constant eye out for the tracker to set off while you're running across the city. The tracker is likely to show up quite often while you're playing, as there are 126 Inhibitors in the game.
Later in the game, you'll start to be able to activate radio towers. Once you do, each tower will ping on your map all Inhibitors in a region. This makes the late-game Inhibitor clean-up much easier to manage.
GRE Anomalies are similar in that they can only pay out Inhibitors at night. However, instead of sneaking past the undead, you'll have to fight an evolved undead in a mini-boss fight. After taking it out, along with whatever other zombies it may summon, you'll be free to loot a container loaded with GRE goods, including high-level crafting materials, sellable resources, and yes, more Inhibitors.
Certain skills on both trees require that players have a certain amount of stamina or health, with the former being tied to parkour and the latter relating back to combat skills. If you want to be able to dropkick a zombie, invest in health, but if you're looking to easily traverse around the city and fight using parkour, you'll want to put your Inhibitors towards stamina.