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Some requirements based on your story:

• Easy since you're a beginner programmer.
• Lot of documentation for the same reason.
• Somewhat fast? You need speed but I'm not sure compared to what.
• Perhaps type safety, since bugs could be costly.

I think you might try Kotlin (or Java). Java has more documentation, but I think Kotlin is easier and less easy to make mistakes with.

But you won't really go wrong with something else like Python, Julia, Rust, C#, ...