We had college savings in 529 accounts and lived frugally for a while, making our own car and house repairs, no vacations or leisure activities outside of the home.
Each child worked during their summers in high school and college. Each took out a loan of $3500-$5000 but repaid it with their summer jobs.
The only one who has a little debt is our med school student who has taken small loans to help pay for her housing costs because we’re covering mostly all of her yearly school fees.