Reddit reviews Attack and Interceptor Jets

Wikipedia isn't a bad place to start for some bare basics. Don't lean on it for things like technical specifications, but for broad-strokes knowledge about what an aircraft's niches are (air-to-air, air-to-ground, multirole, carrier-based, etc) it's ok. Another decent starting resource is this book, which I had as a kid. There are some mistakes and omissions, and it's definitely not an "expert resource," but it's a handy guide when paired with the Ace Combat series, which spans multiple eras and generations of aircraft.

Another place I like is Jane's. They publish Jane's Defence Weekly, but you can also get online content to keep up with platforms and technology.