Modern frontend frameworks is the umbrella for courses that compare or move between the major options: React, Vue, Angular, Svelte, Solid, and Qwik. The "modern" framing is recent — these frameworks share concepts (components, reactivity, JSX or single-file components, server-side rendering) that didn't exist or weren't stable in the jQuery era.
Most courses in this category serve developers who already know one framework and need to read or work in another. The transferable concepts — virtual DOM, signals vs subscriptions, server components, hydration — are usually more valuable than memorizing any specific API. The frameworks compete on different axes: React ecosystem size, Svelte simplicity, Solid raw performance, Qwik resumability.