Starting zone from the first chapter, belongs to the Stalkers. Every time you receive a Stalker task out of this zone, you can grab your reward in the Stalker central to the North, or from Wolf. The nice thing about Gordon is that there are lots of veterans, so if you let them die you might get some good weapons and armors – SPAS 12, Vintar sniper, etc.
This is the home of Duty faction, but there is also a big Stalker camp in the base between the destroyed gas tanks. There is also some shaft with a hermit who offers the best weapons in game. Their prices are insane though. The constant missions for defending the base provide a nice income stream.
You can only upgrade the Vintar snipers in the Duty base.
Here you will be in wars with the Bandits constantly. It was impossible to clear their base, but a hot fix came in one of the patches. The only Stalker place you will find is the Flea Market, however all the missions you complete will be rewarded in Gordon.
The home of the only neutral and friendly to your faction – the scientists. Here you can buy a SEVA costume. Over the lake you can find two artifacts, one of them is always the Eye – 20 000 rubles in cost. The enemies here consist are zombies and mutants, having a strong shotgun will help you live as the zombies at this point are no longer dying from only a knife hit.
Probably the hardest place ever. The moment you get in you have to chase Strelok, then you get ambushed while having bad armor and rusty weapons. Prepare for lots of actions, anomalies, mutants, artifacts and if you are a friend with Freedom – a battle with twelve heavy armored Stalkers.
A good sniper from the Freedom base will help you get them down easily though.
Two artifacts are waiting for you next to the rocks in the map exit, guarded by a giant Flesh Mutant. I couldn't kill him, so I just grabbed the artifacts and ran away. If you pass these zones you will have enough money and ammunition to continue during the rest of the game, which I'm not going to spoil for you.