Everything starts with tuning; and if you're a guitarist it's a burden you have to accept. Pianists? They have it easy! Set and forget. But every time you pick your guitar up to play you'll need to check it's in tune. So invest in a decent headstock tuner and pedal tuner. But what if your acoustic or electric guitar won't stay in tune for long?
It's a very common issue and there's no one answer because guitars are all about variables. But there are definite factors and issues that can cause and even combine to make keeping your guitar in tune more challenging that it should be.
