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Don't use for in the sense of about. The chief use of for is to convey the idea of being in favour of. If we say that the teacher spoke for bad habits it's like saying that he/she spoke in favour of bad habits!
Place the preposition for before words or phrases denoting a period of time: for three days, for six weeks, for two years, for a few minutes, for a long time. Use it with any tense except the present.
For is often omitted. We can say: I've been here for two years or I've been here two years.
We use in to describe the physical location of something as part of a larger thing or place. We use at when we're talking about an address, a public place or building (a bus stop, the Post Office, the library etc.) and cases in which the location is irrelevant but what we do there is what matters (school, the dentist, dance class etc.)