I just started playing guitar last year. I never changed the chords. When my sister started taking guitar lessons her teacher said that she needed to change the chords. When i bought the guitar it came with steel strings but i bought nylon strings because they are easier on the fingers. The problem is i already tuned up the guitar but it sounds really bad like if it was not tuned. What can i do about this?
Both are designed deferentially, they have their own sound and music distinction and so as their string you should use what is appropriate to them.
Steel and nylon strings are not interchangeable. Guitars are designed and built for either steel or nylon. Using steel strings on a guitar made for nylon will just destroy the guitar. Nylon strings won't break a steel string guitar, but they probably won't sound that great (different woods sound better with different types of strings)