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In a sentence beginning with an adverbial clause, express the personal pronoun as the subject of the main clause
Use further to mean both greater distance and more of something. We only use farther for distances: I live a bit farther away than you. Don't use it to mean more. We use further for both meanings in modern English.
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.)