I never assume the guitar is in tune. Mine holds tune very well, and I still check them every time I play. As a guy on the newer end of the playing time, I havent realy got the tune by ear thing down yet, so a clip on tuner is my friend.
What I'm doing now is tuning by ear and using the tuner to check I'm right, then don't watch the tuner while I adjust and check again. Takes a bit longer but gives you the practice while ensuring you do end up in the right place. Less often (because it's less often needed e.g. changing strings or tunings) I'll try to do the coarse adjustment by listening to the intervals (4th / major 3rd) before going to 5th fret / 4th fret checking.
Yes, a tuner is essential (headstock/clip on is a good choice). Probably the most important piece of gear after the guitar itself.
SinisterShadows wrote:I can play a few songs using a high E and sometimes a B, but am not good at playing the other cords. Is that bad to play a song only using one note?
Something I don't quite follow here, E and B are notes. Chords are made from three or more notes, major chords get named after their root note, so E and B can also be short for E (major) chord, B (major) chord. But you ask about playing with a single note. So either you're playing E and B chords or you're playing single notes. OR, you mean you can play some tunes on the 1st and 2nd strings (high E and B)? A plain B chord is not one a beginner would find easy to play.
SinisterShadows wrote:When I'm trying to play a song, it doesn't make the right sound. like, the strings vibrate. However, if I hold down the strings on the neck, it makes every note sound flat.
This also sounds a bit odd. You should fret (press down) on the string just above (headstock side) of the fret itself, not directly on the fret. Don't press too hard or the note will go sharp, just enough for the string to be in contact with the fret without buzzing. If you press down right on the fret then your fingers will mute the string giving a dull sound. The strings are meant
to vibrate, it's what makes the sound! I think you might be talking about the rattling/buzzing noise you'll hear if you don't fret hard enough.