A warm welcome to the world of crypto currencies, we need more developpers.
There's no such thing as a "best place"... It is always different, and somewhere else
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But there are learning sources, next to bitcoin.org, as the reference page.
And the world doesn't stop with bitcoin, there's the whole altcoin world.
I had it very easy to get started, after reading Andreas book "Mastering Bitcoin", which is available in many languages, and can be read online.
bitcoin.stackexchange.com is a webpage, that serves as a Q&A forum, and many, many technical questions are answered there, especially when it comes to details of how to construct transactions.
And then it depends, what you want to program. A web page accepting coins - good start! A wallet software? This is a task, which requires serious knowledge on crypto and security. Usually you need some years of experience in this area to start building a secure wallet. A whole new crypto coin? Phew :-)