Like what exactly? This is a story literally about a study, to make sure it's safe and effective, and nothing went terribly wrong. Billions of people have gotten RNA vaccines now, the vast vast majority with no issues. Vaccines are one of the least riskiest things done in all of medicine.

RNA is produced by the metric crap load in every cell of your body from your own DNA all the time. It's all quickly degraded inside your body after it's made (or else your body would have no way to really regulate expression amounts of different genes), and RNA in an RNA vaccine is no exception. Your own cells translate the RNA into a viral protein, and then your immune system reacts to the viral protein, just like in many other vaccines. Any RNA injected is quickly destroyed by your body, but not before some protein is able to be made. This is way easier than making giant egg farms or finding ways to culture viruses en mass to make the proteins to inject or other things like that. And if you've ever had a live virus vaccine in the past (most have), guess what, that had RNA or even DNA in it in some cases as well!

Every virus you've ever been infected by in your life has led to the creation of viral RNA in your body, for the entire viral genome for each virus. The vaccines are just putting in RNA that codes for a single viral gene, so even less than in a real infection. Again it gets degraded pretty quickly like any RNA without a virus there to make more.

This is totally different from things like gene therapy or gene editing, which involve either injection of DNA with some kind of viral vector or modification of DNA.

No need to fear monger misunderstandings about what RNA is.