How do I get rid of this
This keeps coming up on my iPad I can’t do anything on it like download and apps or books
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This is not a fault - but is a security warning.
The error indicates a problem with the TLS/SSL Certificate trust-chain - and us usually indicative of a security issue. Without a greater understanding of your network connections and configuration, an exact cause will be impossible to diagnose remotely.
Are you connecting over a Corporate/Enterprise/Educational network, using VPN, or some other non-domestic network or connection? If so, there may be deep-packet inspection configured on the network, which will interrupt end-to-end encryption. This situation would account for the security warning that you see.