Yellowing of older bottom leaves is normal and nothing to worry about. They will eventually fall off.
That’s typical on them autos. They seem to flower fast and deplete your plants of mutes. Also being lower leaves means low light and that’s normal.
Best practice is to remove them yellow leaves as they appear. Dead leaves will attract decay, bugs and fungus.
Plants can fight some these attackers internally but once the leaf dies all the protection from the plant is cut off so you need to terminate them dead leaves.
Myn did that in the beginning on one plant and it was only two lower leaves but then it was my ph unbalanced tap water that I was feeding it killing my plants