To the OP
@HunterCL, lots of great advice here. I know it’s frustrating and this hobby can be difficult but everyone here is here to help you. I’ve gotten better advice on this forum than I have from any LFS.
One of your corals (2nd) pic looks like an SPS. And it’s bleached, therefore dead. I once put SPS frags in my tank when it was 3 or 4 months old maybe. They all bleached a month later. It wasn’t that I wasn’t doing things right per se, but my tank wasn’t mature enough and therefore, wasn’t stable. SPS corals need extreme stability. I’d recommend researching the corals you want before buying. There are certain corals that I just know I wouldn’t be able to keep. I’d love to have them but I know better.
@moto4rr mentioned that you need to check your alkalinity. This is very important when acclimating - as well as to keeping healthy corals. Too high or too low and things start dying. Calcium is very important too - especially if keeping LPS and more importantly SPS. you can probably get away with not testing calcium to be honest. If you do regular water changes with quality salt and you don’t have many corals, you should be ok.
The best advice I was given by multiple ppl on this forum was to “be patient”. Good luck!