Sure.U see in music we have different scales.Each song[tabs] is played in a particular scale.By knowing which scale the song is played on,we can easily play the chords of that song.
For example the basic scale starts on the letter or note C and is therefore called the C scale.
So it goes- C D E F G A B
Now in between each of these above notes there is a semitone designated as sharp(#) of the previous note or flat(b) of the next note
So if U start on a C note on ur guitar and go on playing successive frets on the same string ,ur fingers will progress thru the following notes-
C C# D D# E F F# G G# A A# B C ...and so on
-note that betweeb B and C and in Between E and F there are no sharp notes.
-now note that Csharp or C# can also be called D flat or Db and D# is the same as Eb
I ve attached the PIc of the C note on the guitar so that u can see what i mean
Now Jaadu HAI nasha hai was played on a scale in which the first note was E flat,so the scale was-
Eb F G A Bb C D
notice in this scale if U start on Eb note u have to play the Bb note for it to sound right.And this scale has it own set of chords as opposed to differnet chords for the basic c scale.