I’ll Start it off…
1.) Tune Up – Now matter how bad-ass you are at playing your instrument, people will think you suck if your instrument is out of tune. For stringed instruments - If the tuner says you’re dead on and you still are a little off, maybe a new set of strings are in order. If the strings look corroded and are dented up above the metal fret wire, they are way past over due for some nice and shiny new ones. Make sure your instrument is properly intonated.
Now… someone goes next…. :rolleyes: