Excellent first year!
Agree, don't cut sunburned leaves with dry spots.
The Dendrobium looks like a Den. phal hybrid. They need to be warm, and watered when dry, all year, with a little less winter water. If it's cool in winter they need to be fairly dry. Leaves should last for several years on the tall pseudobulbs. You either didn't water enough, or you overwatered and killed roots.
Some cats will destroy any house plant within reach. You have to figure out what you want to do.
You've learned how important it is to know the sun's path overhead. It changes with the seasons, and it's important to know where it will be through the year. You've also learned to think before removing shade cover, whether trees or artificial.
Zygopetalums mostly live in cool, humid high elevation areas. They don't stand a chance in heat.
Before you buy plants, look them up. People talk about orchids and temperature with a rough scale: cold, cool, intermediate, warm, hot. I don't even buy intermediates unless I know they can take it a little warmer. Unless it's at least intermediate-warm growing it won't do well in Phoenix. I would think you have the same issue.
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