529 plan research

I started with reading this - https://www.forbes.com/advisor/personal-finance/best-529-plans/

It does a good job of introducing 529 plan and benefits/drawbacks, and points to further resources for in depth reading.

https://thefinancebuff.com/529-plan-deduct-and-run.html

This explains which states give tax breaks etc.

https://www.savingforcollege.com/ is a good starting point to educate yourself about college savings.

Great tool for estimating monthly savings to reach your college savings goal - https://www.fidelity.com/misc/college-savings/college_savings.html