Vaccines ?

For those who know more then I which vaccines are the most important ones? For example the Hepatis B ? I was reading about it and why would it be giving? My baby is not having any kind of intercourse ? Especially the second dose ? Like his appointment is not until next month I wanna be able to inform myself and know which vaccines he actually needs the most. His definitely not getting hepatitis b forsure . Makes no sense. But if you can educate me more it’s helpful no hate please