Hello and advice sought

[tucansam]

Hello to all.

Over the last year or so, my wife has received three orchids, all of which are now in my care

I suspect that all three were simple big-box-store-bought plants, given on holidays. Neither she nor I know anything, really, about them, but they are beautiful when in bloom and I've been trying to educate myself over the last week or so.

All three have issues. The two oldest plants have varying degrees of root rot, and I have since re-potted both, although the re-pots were hasty at best and I may attempt to do it again, having learned more about the process, if it will not stress them too much.

The third plant has been in our home since Valentine's day, is still in bloom, but has developed spots on the leaves, yellow leaves, yellowing in the crown, and strange (almost like burns) spots on the flowers.

I do not wish to be just another noob who shows up to beg for help, and have been reading every website I can get my hands on. Still, having done that, I am having trouble diagnosing the problems and symptoms of said plants.

I have taken numerous pictures of each plant, but again, before I spam the forum with a ton of pics and newbie questions, I wanted to make sure I would not be ruffling any feathers by doing so!

I look forward to trying to bring these beautiful plants back to full health and enjoying them for many years to come, with much assistance from seasoned growers and kind souls here.

I will post details of their care thus far and pictures if requested.

Thanks!