Renovating the bathroom and found these dark patches in the joists and roof lumber surrounding the old vent pipe. The PVC part is new.

Anything bad here? Anything we need to address?

I'm cleaning this cabinet above the range/micro and noticed this mark on the back. I mostly keep cooking oils, vinegars, etc in here. Does this look serious?

Update: well it ain't pretty, but it shouldn't burn the house down. For anyone concerned, my electrician approves. Thank you all for your help today.

I need a small amount of joint compound for random drywall repairs. Is there any real difference between different brands? Do any of them last longer than others after they have been opened? Any other considerations with knowing? Since I don't need a lot I don't mind spending a few extra bucks, but I'd like to know if it's actually worth it.

When our first child learned to use the potty we used diapers during naps and overnight. The nap diapers faded after a month or so, but the overnight diapers took like a year. What's worse is that he started pooping only when he had the diaper on, usually in the morning before getting out of bed. This was... not ideal.

I imagine that if we just ditch the diapers entirely then we would have a few days of wetting the bed, but maybe that's worth it? Or does it become a persistent problem? Or does bed wetting at this stage create unexpected problems? Any experience or advice would be great!