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Welcome to 2CarPros.

If nothing electrical works, confirm there is a good ground from the battery to the engine block and body, and confirm the positive cable is in good condition and tight on the starter.

Next, confirm that the fuses in pic 1 are good and there is power to the circuit. Check to confirm the 30 amp circuit breaker is good in picture 2 and there is power in that circuit.

Here are a few links you may need and find helpful, or you may already know these things.

https://www.2carpros.com/articles/how-a-car-fuse-works

https://www.2carpros.com/articles/how-to-check-a-car-fuse

https://www.2carpros.com/articles/how-to-use-a-test-light-circuit-tester

https://www.2carpros.com/articles/how-to-check-wiring

Let me know if this happened all at once or if there were electrical issues prior to this.

Take care,
Joe