some basics on how mRNA vaccines work:

References:
1. Shin MD, Shukla S, Chung YH, Beiss V, Chan SK, Ortega-Rivera OA, et al. COVID-19 vaccine development and a potential nanomaterial path forward. Nat Nanotechnol. 2020;15:646–5

2. Dai L, Gao GF. Viral targets for vaccines against COVID-19. Nature reviews. Immunology, 1-10

3. Sompayrac LM. How the immune system works. Malden, MA: Blackwell; 2019

4. Owen J Punt J Stranford S. Kuby Immunology, WH Freeman, 2019