How to tune up a guitar for optimal performance?

To tune up a guitar for optimal performance, use an electronic tuner or a tuning app to ensure each string is at the correct pitch. Start with the low E string and work your way up to the high E string. Make small adjustments to the tuning pegs until each string is in tune. Check the tuning multiple times to ensure accuracy. Additionally, check the intonation by playing a harmonic at the 12th fret and comparing it to the fretted note. Make adjustments to the bridge saddle if needed. Finally, check the action of the strings and adjust the truss rod if necessary for a comfortable playing experience.