The areas listed first are generally easier, but may not always be the best. Sometimes it’s easier to kill infested enemies even if they are 15 levels higher than grineer enemies. It all depends on personal preference. There really is no true “BEST” place to farm any particular resource, it’s all about trying to increase your probability of getting the materials you need while decreasing effort and time. That is the purpose of this guide.
The best way to farm is to couple your material farming with something else. That may be experience farming, trying to get weapon/warframe parts, or even trying to get multiple different materials you need. For example, if you need salvage, your best bet is to combine your salvage farm with whatever other uncommon/rare materials you need, e.g. Mars if you need salvage and morphics/gallium, Jupiter if you need neural sensors and salvage/alloy plate, or Kappa if you want XP and also want to farm salvage/alloy plate/rubedo. If you need morphics or control modules and you want to get nova parts, you should definitely start with farming Raptor for her parts, possibly (hopefully) getting those rare materials in the process.In general, farming bosses is a very mediocre way to farm resources. If you’re playing solo, it’s probably much easier to rush to the boss than to try a defense alone. If you’re with other players, however, it’s much better to play defense/mobile defense/survival missions. Bosses can be a quick way to get that one resource you really need so you can start building that Ash helmet before you go to bed. It’s much, much better to try for J3 golem than to sit in a defense for at LEAST 5 waves hoping a neural sensor drops. If you have the time, however, and you know you need more than 1, those types of missions will net you a lot more resources for the time you spend on them.