Youtube shows many films on the topic. Here are a few selected ones with a focus on practical tips.
Maike Jarsetz: Colour cast correction in Lab mode
Martin Burmester: Why edit images in Lab?
https://www.youtube.com/watch?v=frpmcyHhG2k
Michel Meyerle: Image masking in Lab mode
https://www.youtube.com/watch?v=ZuoNtN3smEA
Especially ingenious - Jochen Becht (with a cold): Making a 3D CIELAB colour space in Photoshop
https://www.youtube.com/watch?v=6Cyi4OIeo9A
...many others are available on Youtube. Search for "Lab colours" or "Lab mode".
