In the Major Pentatonic scale, you basically skip the 4th and 7th degree. The C Major Pentatonic, for example, would be C D E G A instead of the normal Major scale of C D E F G A B. Note that the F and B are omitted.
In terms of shape, it would be almost the same shape as if you’re playing the major scale.
In the Minor Pentatonic scale, the 2nd and 6th degree are skipped, which means the C Minor Pentatonic would be C Eb F G Bb.
I hope that helps