Many people use tabs in the beginning of the line, and spaces for anything after any visible character in the line. If people choose a different way, is becaus

Many people use tabs in the beginning of the line, and spaces for anything after any visible character in the line. If people choose a different way, is because they have a reason, or they don't care. If you're not sure, use whatever the file already uses, or the way I described above, or whatever makes you feel fuzzy inside. In that order!