General queries re: private app

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I'm new to Shopify, & have explored its feature & created a custom form app to perform a normal CRUD operation. So could someone let me know the information on the below points:
1. Is there any way to create a custom table in Shopify or if not then how should I save my submitted form entries?
2. Is there any limit on maximum character length for data stored in metadata fields?
3. Do I need other servers to host my private app for UI or it can be done in Shopify itself?

Please let me know the answers to the following request.