Scales to Play Over Bsus2
Every chord is a subset of several scales: any scale that contains all of a chord's tones fits over it. Pick a chord to see the matching scales from its own root, the major keys the chord belongs to, and full fretboard diagrams for every scale on guitar.
A Bsus2 chord contains the notes B – C# – F#. Any scale that includes every one of those 3 tones fits over it — from the root B, that means B Major, B Natural Minor, B Melodic Minor, B Harmonic Minor, B Major Pentatonic, B Rock 'n' Roll, B Dorian, B Lydian, B Mixolydian, B Dorian Bebop, B Mixolydian Bebop and B Gypsy Minor. Start with the first scale listed: it is the most common choice, and the others color the same chord tones differently.
Bsus2 is also diatonic to 5 major keys: A major (relative minor F#m), B major (relative minor G#m), D major (relative minor Bm), E major (relative minor C#m), F# major (relative minor D#m). In a song from one of those keys you can also solo with the key's own major scale or its relative minor pentatonic across the whole progression, not just this chord.