Fitting

Buying a robot only gets you a chassis itself. It is not very useful without outfitting it with modules.

"Fitting" can refer either to a module loadout (e.g. "PVP fitting", " send me a screenshot of your fitting"), or to resources (CPU\Reactor), especially if someone says something like "This module\robot has better fitting"

Slots
There are 3 types of slots on each robot:  head ,  chassis  , and  legs . Slots on the chassis subdivide into  turrets , (such as railguns, lasers and firearms)  missile launchers  ,  industrial modules  (e.g. mining modules) and  miscellaneous  , like electronic warfare modules. Each bot also has a limitation on how many  missile launchers  or/and  turrets  can be equipped on a robot.

Resources
Every kind of equipment requires CPU and reactor capacity from the robot: reactor supplies the module with energy, the CPU does the actuation. The requirements of all the fitted modules can't exceed the total performance of these two robotic parts. The  available output  shows how much of these resources are there left to utilize.

To increase the CPU capacity, a Coprocessor is usually used, alternatively, you can try to increase your Data Processing extension or replace some modules with T2 variants which have reduces CPU consumption.

Reactor can be increased in the same way, by installing a CoReactor or Reactor Expansion extension. Most T2 modules also come with a reduced reactor consumption (though not all)

Purpose
A certain fitting of a robot usually pursues some goal, i.e. maximing damage, speed, tank, or balancing parameters in a way that helps you achieve that goal, be that murder or picking flowers. It is half-science and half-art, with new ways to fit a robot still being discovered.

There are however general rules that will help you build a decent bot.


 * 1) Don't mix your guns. Having Magnetic, Laser and Missiles on one bot usually results in a worse performance of them all. Mixing short-range and long-range guns usually also doesn't end well.
 * 2) Keep in mind your robot's bonuses. If you have +50% to repair amount (like Nuimqols do), there's no point in using shields or passive tanking.
 * 3) Mind your robot mass. More plates\shield\etc means you are slower and that sometimes might be more important that defence
 * 4) Don't try to do everything. a Robot that can mine, scan for artifacts and shoot usually can't do them nearly as good as a specialist.
 * 5) Usually, you want to keep your modules of the same size as your bot. I.e. if you use light or assault, you use small modules, if you use a mech or heavy mech - medium modules
 * 6) These rules are a bunch of old nonsense. There are some niche fits that break some or all of them and are still effective in their own little niche. Just make sure you're not slapping modules together and put some thoguht into it.