ok this is how i learnt the notes easier nd quicker - just like evryone else did - maybe.

Say outloud - important to say it outloud so u know consiously if uve made a mistake. Oh and do it backwards saying the flats instead of the sharps.

the string notes starting from the 1st string [thinnest] are

e - FF#GG#AA#BCC# etc...
B - CC#DD#EFF#GG# etc...
G - G#......
D - D#......
A - A#........
E - F......

now there are common notes called enharmonic notes
these are those famous whether the note is F# or Gb etc..

if u play down towards the bridge thats doing the sharps chromaic scale so all the accidentals [# or b] would be sharp. and if u play from the bridge towards the nut they would be flat.

technically the position played for these enhrmonic notes are the same F# would be either F# or Eb at the same fret say on 6th string 1st fret. its just in relation to what ur playing.

So there is a not called D# and it is the same note as Eb = even on piano if ur G/f plays from the treble to the bass notes she will be playing the flats so it would sound out as an Eb the other way round it would sound out like a D#