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There's tons of stuff online to help you learn, especially if you want to get grounded in theory. Also, if you know anybody who plays guitar, just hang out with them and absorb everything like a sponge. That's how I learned.
Take lessons. It'll give you the discipline to learn the basics in a relatively short period of time. I started off with 6 months of lessons and then a few years later took another 6 months of jazz guitar lessons. That improved my playing immeasurably.
Also, get a chord chart and the song books by some of your favorite artists and play along. This method has perks, like being able to adapt to different styles and manners of play. But this method also has pitfalls. For example, if you learn all of Bob Marley's songs and then write a song for yourself, your new song inevitably will sound like a bad Bob Marley knock off. That's tricky until you learn enough stuff from other people that you find your own voice in the mix.
It's very hard to not sound like a "me too" artist when you are copying. But if you are in it just for fun, then there is no harm in learning your favorite songs.