Are there any keyboard shortcuts to switch between tabs in terminal?

These are the shortcuts listed under the Terminal -> Window menu. On older MacOS versions they were called Select Next Tab and Select Previous Tab.

• Show Next Tab: ⌘ + > (selects the tab to the right of your current tab)
• Show Previous Tab: ⌘ + < (selects the tab to the left of your current tab)

I think it would make more sense to say ⌘ + ⇧ + ] / [ , since that's actually what you type.

How to set custom Terminal shortcuts?

Since there are menu items that these shortcuts trigger, you can use System Preferences-> Keyboard-> Keyboard Shortcuts-> App Shortcuts to reassign the shortcuts to whatever you want. Click + to add a shortcut:

1. Application field - select Other. (at the bottom) and navigate to Applications -> Utilities -> Terminal.app .
2. Menu Title field - type the name of your shortcut, e.g. Show Next Tab (you can find the exact shortcut name in the Terminal -> Window menu, where the default shortcuts are listed)
3. Keyboard Shortcut field - press your custom shortcut keys.