Sort your intonation
Because your strings sit above the fingerboard, when you depress them onto a fret there is a slight sharpening of the pitch. This can be compensated for by slightly increasing the speaking length of the string at the saddle. With fresh strings fitted and a properly set-up guitar, plug into a good and accurate tuner. Next, sound the harmonic at the 12th fret and compare that with the fretted note at the same fret. If the fretted note is flat, the bridge saddle needs to be moved forwards (towards the nut) and vice versa. It’s always best to recheck your intonation when you change string brand and/or gauge.