1. All that glitters is not gold holds true for most of the guitars you lay your hands on. A costly guitar doesn’t mean that it will have the most melodious of tune and best of the parts. While buying a guitar always select something with good built material, else you sound could die down or become shaky. Also check for the string stoutness and if you instrument gets out of tune too often you should look for an alternative.
2. The next important thing is that you should learn the basics well, either from a guide book or a teacher. You must know the different chords and your finger position. Practice the basics with proper finger position till it becomes just a muscle memory. You should also learn to pick up speed while you play and execute them without any gap between each note.
3. One great technique to improve your speed as well as you rhythm is by playing along with drum or some accompanying instruments. It will help you to check your tempo, rhythm and give you confidence to strum along in actual or live events. Always start from beginning of the tune if you make a mistake so that you can maintain the continuity. Try never to skip beats as it may result in incomplete or abrupt end to your music piece by catching your partner unaware.
4. The more you learn, the more you would try to innovate. Getting a guide book or a tutorial at this stage would be very helpful as it will help you to cross check what you learnt and what more is left. It is a great way to go back to the roots and reinvent what you missed out at the first go.