Usa sa effective way pagsipra is know the SCALE and its location in the whole fretboard.
Once you know the KEY of a song, let your fingers play only on that scale. Dili gyud masaag imo tono ana.
Example: Song on the Key of C, padagana imo note only n the key of C (CDEFGABC) dili na siya ma sintonado.
As you progress, you will learn RELATIVE Minor can also be better sounding. Ex. Relative Minor of CMajor is Aminor. You can use Aminor scale or Am pentatonic if the song is in the key of C.