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What's New in React 19?

A short, free catch-up with Bob Ziroll: a set of scrims walking through what React 19 actually changes, from actions to the new use API.

Quick answer​

What's New in React 19? is Scrimba's free, advanced-level course taught by Bob Ziroll. It is a short set of about 16 scrims covering the headline React 19 features: actions, optimistic updates, the new form status hooks, and the use API. It is a focused update for developers who already know React and want to see what changed without re-learning the basics. It is free, so the only cost is the time to watch and code along.

Is it worth your time?​

If you already write React and just want to know what React 19 actually changes, this is the most efficient way to find out. Bob Ziroll skips the basics and goes straight to the new surface area: actions for handling async work in transitions, optimistic UI updates, the form status hooks, and the use API for reading promises and context. It is free and short, so there is little downside.

The honest caveat is that it is a feature tour, not a course. It assumes you are fluent in React and will not slow down to explain hooks or state. It is also narrow by definition; it covers what is new in 19, not how to build with React generally. If you do not already know React, this is the wrong starting point.

What you'll learn​

This is a short, focused set of scrims rather than a multi-module course, so there is no curriculum breakdown. Across roughly 16 scrims it covers the main React 19 additions: actions, which streamline async state updates and pending states; optimistic updates for showing results before a request resolves; the new form status hooks for reading submission state; and the use API, which lets you read promises and context more directly inside components. Each is shown as a small, codeable example you can run in the player.

Who it's for, and who should skip it​

It fits developers who already know React and want a quick, current rundown of the version 19 features so they can start using them.

Skip it if you are still learning React. The features here build on a foundation this course assumes you already have. Do Learn React first, then come back when you want to catch up on what is new.

Prerequisites​

Solid, hooks-based React: components, state, props, effects, and async data fetching. This is an advanced catch-up that builds directly on that and does not re-explain it.

Where it fits​

This is a stay-current side course rather than a core step. It is listed under the Frontend Developer Path and the Fullstack Developer Path, best taken after the React fundamentals when you want to keep up with the latest version.

Free or Pro​

This course is free, with no subscription required to start or finish it. You can take it on its own without Scrimba Pro. If you later want the structured career paths, the coding challenges, the private Discord, and path certificates, those sit behind Pro; see current plans.

Strengths and limits​

What it does well: it is free, current, and tightly scoped to exactly the new React 19 features, taught by an instructor whose style carries over from the other React courses.

Where it is limited: it is a feature tour, not a full course, it assumes fluent React, and it is intentionally narrow, covering what changed rather than how to build with React broadly.

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