Soloing

Some info for me to keep in mind from my internet guitar teacher;

1) In Bb, can use Gm and vice versa.

2) Analyze songs in terms of progressions rather than individualized chords out of context. 

Example: Bb Major scale can be used over Am7b5 / D7b9 / Gm7 because it's the relative minor 251 progression.

Example: Cm7 / F7 / BbMaj7 work with BbMaj because all these chords are based on the key of BbMaj.

Example: You can often see key changes by looking for common progressions (like 251's) in a different key.

3) If chord progression isn't clear, look at melody notes which might suggest a new key.

4) In a modal tune in which the chordvis Dm, the first chord can be a modal Im7 chord in D Dorian.

Or:

It can be thought of as a iim7 chord in the key of C Major.

Or: 

It can thought of as a I chord in the key of Dmin.

Or: 

You could think of it's relative major, F major, and play lines like that.

Note: none of these are right or wrong. They simply result in different sounds or effects.

5) Find a way to analyze changes that makes sense to me, use it to inform my soloing, but be aware that there is never just a single correct way to analyze a chord change.