So the take away here is, as a beginner, not to worry so much about the entirety of the mode, but trying to target the chord tones that make the chord you're playing over?

Also when you said, think in terms of key, chords, and melodies, what do you mean when you say chords and keys? The masterclass I watched talked about how different modes kind of are their own key, and have specific chord progressions within the main scale that corrospond with the mode?

There are really clearing things up for me, means the world