Sure. Wix provides a full development environment for building a site - including frontend and backend. To learn about programming with Velo, read the following articles that will help you start working with Velo:
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About Velo by Wix - what Velo is and what features it has.
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Getting Started with Velo by Wix - step-by-step tutorial on how to start using Velo.
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Onboarding to Velo by Wix - introduction to Velo with short tutorials.