Stalker Anomaly is a great experience but it will tear you apart given the opportunity, The way i see it is its something to look forward to while you play some of the greatest games ever made. If you go into anomaly without prior knowledge to the zone such as e.g how to manage your inventory, how to play your gun fights according to your gear and weapons, what territories belong to what factions, how to hunt for artifacts with detectors.
The following games are stand-alone mods. Shadow of Chernobyl Clear Sky Call of Pripyat.
Because Anomaly expects you to understand the Laws and the unspoken laws of zone. Besides improving the original 3 STALKER games, the project also has new HD textures and custom ReShades for 3 new stand-along mods. In anomaly There is Much more items weapons, quests and a incredibly in depth crafting and repairing system that is overwhelming at first even for veterans of the series so in saying that i HIGHLY recommend you play through SoC and CoP at the very least before you play Anomaly or else you will have a nightmare of a time. No Problem bro! Also as for Anomaly it is a Standalone mod Built off of another great mod called Call of Chernobyl (because Anomaly and CoC are standalone Mods it means they are completely free you don't need to own any Stalker games to play Anomaly or CoC) What Anomaly is, is a hardcore Stalker experience that blends All Maps from the previous 3 games into one giant Zone or Map it also has some of the hardcore mechanics from a Stalker Call of Pripyat mod called Misery.