Metronome is a device that produces metrical 'ticks' settable in beats per minute. Practicing with a metronome helps you to improve your skill far faster. Start with the slowest tempo you can play clearly and continuously without mistake. Then slightly increase the tempo, and make sure you are still able to play the same stuff correctly,to the song's original tempo. Find the hardest part that you always get stuck and practice particularly at the part. ( might be at somewhere between 2 chords) Someone criticise that practicing with metronome makes you being more mechanical. Don't worry. Just keep going. At some point , you will play musically. Music will lead your way. ^^ Now , I insist you to practice with a metronome. Find one and start playing.