check your tubes. If you are getting "snake bites" it is 99.9% likely your tire pressure. At the rate that you are going through tubes, it's cheaper to get a proper floor pump with a guage. Then check and inflate your tires before every ride.

If you are not getting "snake bites", check/replace your rim-tape.

2nd on aligning the valve stem w/ tire logo tip above. That's the real reason people harp on logo alignment (it's not about aesthetics). After a flat, you can find the hole on the tube and corresponding spot on the tire b/c you aligned them both up.