While your source is being a random asshole on reddit 🤣

Thats not true. My Dad approves stuff and has worked as an engineer and his degree is in Physics. He's a pretty high up guy at Nasa now. I also have interned as civil engineer and my bachelors is Math.

The baseline is a usually bachelor's degree, depending on what you want to do requirements may vary slightly. You can get an internship without a degree but usually you need to at least be a currently enrolled sophomore in college. I forgot to mention, though, it is possible to get into the field as an engineering technician but even that requires a 2-year degree still. Thats a much more hands-on position usually, so if you want to do engineering and work with yojr hands thats probably the best route.

Someone mentioned a high-school internship. Ive never really heard of that, but i cant imagine what that would entail exactly as most (almost all?) high-school students lack any sort of training in the necessary software to be successful in engineering.

Electrical, maybe. Civil probably not.

Your question is somewhat unclear. If you mean get an internship and not be in college, then go on to work as engineer, ive never heard of that. I know in the US pretty much every employer requires at least a bachelor's, usually in engineering, but sometimes math and physics and maybe CS are okay. You need to know vector calculus and differential equations at a minimum, and if you do cryptography, at least asymmetric-key cryptography, you need to have a good foundation in group theory. You also need probability theory for cryptography in general, if not for developing encryption schemes, then for proof of different notions of security.

I came here to say this. But electrical engineering is more than just circuitry. Cryptography and signal processing are fairly large sub fields as well.