Hi all (Wooh, first post!)

I'm relatively new to guitaring but was intrigued when I noticed this;

I was using a chord program on my pc to learn chords, I noticed that you can play chords in various positions up the neck eg; there were three positions for ABC etc.

My question is even though they all sound different, so how do you go about using them + can you use any that you want in a song? I play songs from this site using the basic open chords but if I used these other ones they change the songs sound completely.

thanks for reading and any help you can give!
It would change the sound a bit, but you should always search being practical, using the least huge chord changes possible. That way you make less movement and can actually play more chords when it comes to a song that might be a bit harder.