label example I can check in the table eav_attribte like the below images.
But in which table I can check it's Input value if I put a value Test for the field example
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Depends entirely on the setup of your extension
See here for example
I add an attribute but also I add a column to the sales order grid and the value set at checkout is transferred
This process is quite involved. Try to understand as much as you can from my extension. See setup and observer event.
Once the value is in the order grid table you can filter, search and associate to an order a lot eaiser. Which means loading it via block logic for example is more logical.
When you add any custom field in Checkout Page need to add data in mainly two tables.
For more understanding download module from GitHub and make changes as per requirements.