It looks like the bottom of my Christmas cactus I just propagated last year is rotting I don't really know what to do and if it can be saved? It just started growing new leaves too... I was wondering if there is anything I can do to save it. It's hard to see because it blends in with the dirt but parts of the bottom are brown.

It looks like the soil has been kept too moist and has caused the base of the stem and probaly also the roots to rot. If so, it may not recover. All you can do is let the soil dry deep into the pot before watering lightly.