Because if your guitar isn't in tune you'll never sound good ... But you don't need to tie any knots in your strings – tuners are designed to hold the strings in place. It's all about slack ...

With the guitar roughly in tune, don’t sweat it ... Pulling the strings like in the picture settles and tightens the winds and knots up. If you have any slippage we recommend having another ...

Both the App Store and Google Play are replete with guitar-tuning apps that are full of either upsells or advertisements. Isn't there any application that helps tune your guitar without bothering you?