Does getting covid19 make you immune to a reinfection or just less likely to be reinfected?

We don't know yet.: If was hoped that being infected with COVID 19 would confer strong immunity. But there are reports of reinfections from a number of countries (even though numbers aren't large).

Unfortunately, not necessarily. For a short period of time, someone is more likely to be immune (3 months), but we don't know for sure and it varies individually. Also, now with more variants around, especially Omicron, many people are getting COVID-19 again. So, please take the same precautions: get immunized and boosted, mask up, stay home when sick, and get tested if ill or exposed to COVID.