Before reading the differences between Photoshop and Lightroom, Nicholson, A. (2015) I was still struggling to understand how to use the right editing programme at the appropriate time in my my workflow. Lightroom (Lr) and Photoshop (Ps) offer similar tools. A good introduction is supplied.
Still working on it because I am experimenting with Bridge but this is really helpful.
LP-Simplistically, use Ps for specific shots especially where you need layers and masks. Use Lr for global edits, filters and specifically batch after a shoot.But you could still bridge for that (if it was stable enough).