Sleep regression

I know this is common at various ages and milestones, but no one ever says how to handle it lol my daughter is 2 and I think going thru a regression because she has been a great sleeper for well over a year...so not sure how to handle the regression-do I cater to her crying thru the night and go and console her? Do I let her attempt to self sooth for a bit(how long?!) ? Do I just let her cry at this age? I’m not sure what to do because she don’t want this to become a habit where she needs me to get her back to sleep every night 😳