Yes — there are solid resources for connecting to Magento 2 data (API, DB, integrations).
Short answer:
Use Magento’s REST or GraphQL APIs for most integrations. For deeper access, use direct DB queries (carefully) or Magento’s ORM.
Official docs (best starting point):
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Magento 2 REST API reference — covers catalog, customers, orders, etc.
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Magento 2 GraphQL guide — modern and efficient for storefront data.
Both include endpoints and example requests.
Quick learning paths:
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Search YouTube for “Magento 2 REST API tutorial” and “Magento 2 GraphQL tutorial” — you’ll find step-by-step examples with Postman, JS/PHP clients, and Auth setup.
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Magento devdocs has example curl calls and schemas.
Tips:
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Use OAuth or integration tokens for secure API access.
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For server-side code, leverage Magento development service contracts and repositories instead of raw SQL where possible.
If you tell me your platform (Postman, PHP, JS) and what data you need to connect to (orders, products, customers), I can point to exact docs/tutorials.