There are many items in EVE Online, and knowing which to use can be challanging. I put together these pages in the process researching what items were better for what uses. I have made no claims or conclusions; these are simply summaries of data that can be found in-game and on the game's website.
There are three kinds of turrets: energy [small blasters, by damage], hybrid, and projectile. They each use their own type of ammo: frequency crystals, hybrid charges, and projectile ammo, respectively.
Approximately four dozen different ores [summary] exist, and another dozen alloys & compounds.
There are a few dozen different tech 2 components, all of which have the blueprints publicly available. They do require research skills, however.
I will be adding to this as I need more information. If you have any questions, comments, or corrections, please feel free to contact me.