First Serious Project

Hello reddit,

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I've been working as a backend ERP developer for several years and i've decided to work on a side project to improve my skills in several fronts where i dont have much experience at.

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My idea is to make kind of a fitness web where you can chat with a fitness expert, find nutritional information for foods, and where the fitness experts can sell or advertise their products (merch, workout plans, etc).

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So there are a couple of items that im not even sure where to start. If you could give me pointers or refer me to a tutorial similar to these i'd greatly appreciate it:

1. how to platform the "sales" of the products. And what i should consider for this feature.

2)how to ensure the chat is "targeted" so you only get to chat with specific people. Although i assume this could be done just based on some sort of user profiles, but maybe there's a better way.

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Just as a note im not expecting to actually make money with this, but i want to have the infrastructure as complete as possible so i can learn and also show it in a portfolio.

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EDIT: Should clarify that i will probably use React and Node or React and Django for this.

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Thanks!