From WarzoneWiki

Artifacts are researched at specialized Research Facilities. When researched, Artifacts make new vehicle components and structures available, and improve existing units. Artifacts are the keys to the game. Be sure to research every Artifact you find.

The Research Menu

The research topics (Artifacts) that are available appear here. Left-click a research topic to research it. The results of research are instantly available for use. If you cancel researching a topic, the amount of research performed up to that point is saved with the topic. Later, if you research that topic again, the research continues from its previous position.

Research Effects

The results of research vary according to the topic researched. Generally the results can be easily deduced from the topic, but there will be occasions when you'll have to research it to find out what it does!

Upgrading Structures with Modules

A structure may be upgraded by selecting the upgrade module in the build menu and left-clicking on the structure itself, or by selecting a truck and left-clicking on the structure. Factories, research centers and power generators may be upgraded, after the upgrade is researched.