Our honda odyssey won't start at all, no cranking sound even a bit. We just used it yesterday, but today it won't start. But there's light everywhere if you turn on the ignition key. What do you think the problem is? We appreciate your reply

Remove and fully charge or replace the battery. Most auto parts stores will test and charge batteries for free. My bet is that the battery needs replacing.

This link may help:

https://www.askmehelpdesk.com/cars-trucks/faq-how-troubleshoot-repair-maintain-hondas-selected-other-vehicles-46563-3.html#post235560