How to get started with external development

We moved from an older, unsupported ERP system at the beginning of this year. Now that we are on E10, I’d like to start developing some tools that we can use externally (whether On Prem, or SaaS). I’ve seen a lot of posts here about using Rest, OData, etc… but is there a good article that you would recommend here that can help me get started developing?

So far, I’ve been able to do everything internally, but I’d like to gain some experience on programming using Rest.

Thanks in advance!

Few examples how to use REST with a c# app

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None of that made any sense to me in the past. For some reason today, it all clicked.

Now I am beginning to be dangerous!