My tablet was in use, needed charging, it shut off. Now it won't charge or come on

It sounds like there's a problem with the charger. The wire on the charger is rather delicate. So is the port on your tablet where the wire plugs in. There may be a break inside the wire. If you dropped your tablet while the wire was plugged in and it hit the floor on the charger plug, the charger plug could have damaged the charging port in the tablet or the wire itself could be damaged.
Find someone else who has the same tablet and ask to switch chargers to see if either of them still work on the other tablet. If your friend's charger starts charging your tablet without a problem, then the problem is a a broken wire in your charger. If neither charger will charge your tablet but both chargers charge your friends tablet without a problem, then the problem is with the charging port on your tablet.

Try an overnight charge. Sometimes the battery died completely. If it still does not respond to charging, either your charger or charging port may be damaged.