One could go on for ages about alien technology. They've developed guns the size of planets. They even have toasters that don't tear bagels apart. However, we want to make some mention of alien robot technology. While we devote an entire section to surviving encounters with out of control robots and cyborgs, alien robots are a special case.
Thinkers build many.
Some have subsequently outlived their organic precursors. Both are incredibly dangerous and should be dealt with more as aliens than in the standard protocol for robots. In general we recommend avoiding aliens whenever possible. There is really very little advice that we can give for surviving the unavoidable encounter. If it's a fighter that you're dealing with you're probably toast unless you've got a really big gun.