Where can I sell my 9th generation iPad to buy a new one?

I have a 9 generation iPad I use for college but it dies too quick and I don’t have storage like that so I’m trying to sell it to get money to buy me a new one because I don’t have the money right now to buy me a new tablet or MacBook because I pay my tuition and loan so where can I sell it

[Re-Titled by Moderator]