What specific physical phenomenon is a major implication for planets orbiting very close to a dim red dwarf star within its HZ?

Answer

Tidal locking

Proximity to a dim star can cause strong gravitational pull, leading to tidal locking where one side of the planet perpetually faces the star.

What specific physical phenomenon is a major implication for planets orbiting very close to a dim red dwarf star within its HZ?
Spaceastronomyhabitable zoneGoldilocks