Plant leaves going brown in some places, photos to see. Anyone tell me what it is?

Answer 1

It looks like a sun burn - were they in a spot where the sun was too intense, maybe?  If that is what the problem is, it is not a problem for the plant, just the affected leaves.

Answer 2

Plants purpose loose their leaves when they don't have enough nutrients, so they can preserve the stem.

Try better soil, more sunlight, and correct amount of water (not 2 much/little).

Answer 3

Drop a steamer on em it will cute em