I've enabled template hints and block hints. I get this template path /vendor/magento/module-customer/view/frontend/templates/account/dashboard/info.phtml which has this block class Magento\Customer\Block\Account\Dashboard\Info.
Where can I find the code for the block class?
You can find the Info.php on the below path.
/vendor/magento/module-customer/Block/Account/Dashboard/Info.php
You can override the block file in your custom module with the help of preference. Please visit this link for more information regarding the block overriding.
And info.phtml under below path:
/vendor/magento/module-customer/view/frontend/templates/account/dashboard/info.phtml
You can override this template in your custom theme under the below path:
/app/design/frontend/Vendor/Theme/Magento_Customer/account/dashboard/info.phtml
Hope it helps!!!
You can check this file's Block here
vendor/magento/module-customer/Block/Account/Dashboard/Info.php
You can override this in your Custom module here
app/code/Vendor/Module/Block/Account/Dashboard/Info.php
Hope this will help you!
