Brakes were squeaking and the chain was making a annoying noise

Had to adjust the tension of the brake cables and align the derailleur so it meshed with the gears better

Because the squeaking sound annoying and it was unsafe with the breaks not working fully

Because things like this bike cost a lot of money, if i had to buy a new bike every time it was broken it would get expensive very quick. Its also important as there is less waste if I repair instead of buying new.