How do I get my MacBook to remember my WiFi passwords?

To forget the network that you're currently using:

1. Choose Apple menu  > System Settings.
2. Click Wi-Fi in the sidebar.
3. Click Details next to the network you're using.
4. Click Forget This Network, then click Remove to confirm.

To forget a network that you've joined before but aren't currently using:

1. Choose Apple menu  > System Settings.
2. Click Wi-Fi in the sidebar.
3. Scroll down on the right and click Advanced to see the networks known to your Mac.
4. Click the more button next to the network, choose Remove From List, then click Remove to confirm.

Then, Add them Back using the appropriate credential