What’s the different between Gene-Therapy and Gain-of-Function and mRNA vaccines?

Does the mRNA covid-19 vaccine change the DNA? Does the mRNA covid-19 vaccine, spike protein ever get out of the body?
Is the mRNA covid-19 vaccine safe for the body? Why healthy people die on the mRNA covid-19 vaccine? Why are people getting sick after getting the mRNA covid-19 vaccine? Why some people got so sick after the mRNA covid-19 vaccine and were thinking that’s it I will die?
What’s the different between Gene-Therapy and Gain-of-Function and the mRNA covid-19 vaccine?
What is in this mRNA covid-19 vaccine, do we have the right to know?
Is it a crime to say the covid-19 vaccine is safe and effective and then people die on it, people get injured, people become invalid, people having heart attacks, people have myocarditis from it, the immune system gets damaged from it…? By law, what does it mean safe and effective?
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