I have a lot of affection for what Jeff Delaney has built with Fireship, because it fills a gap that almost nothing else fills as well, which is the need to get the accurate shape of a new technology into your head quickly without sitting through an hour of preamble. The '100 seconds' videos are the obvious calling card, and they are genuinely clever, because in a very short span you come away knowing roughly what a tool is, what problem it solves, and whether it is worth your attention, which is exactly the triage most working developers actually need when a new framework or model drops every other week. The longer build along videos and the paid PRO courses on fireship.io are more substantial than the channel's reputation for speed might suggest, and the full stack and Firebase material in particular is practical, current, and refreshingly free of the padding that bloats so many online courses, so if you are shipping real projects the membership is easy to justify. The humor and the meme heavy editing are not just decoration either, because they keep you engaged through material that a drier presenter would make a slog, and engagement is half the battle in self paced learning.
Where I have to be honest is about who this actually works for, because the same speed that makes Fireship brilliant for an intermediate developer makes it genuinely hard for a true beginner to follow, since the videos assume you can keep up with fast cuts, quick jargon, and code that appears and disappears before a newcomer has finished reading it. This is breadth over depth by deliberate design, and that is a feature rather than a flaw, but it does mean you will rarely finish a single video feeling that you have mastered a topic, and you should not expect to, because that is not the job Fireship is trying to do. The other honest caveat is that fast moving content dates fast, so some older videos reference tool versions and workflows that have since moved on, which is fine if you understand that going in and less fine if you treat a two year old clip as current gospel. My overall take is that Fireship is one of the best things on developer YouTube and that the PRO courses are a fair paid step up, but the right way to use it is as a sharpening tool rather than a starting point.
If you already program a little, it will keep you current, save you time, and make you smile, and that is a rare combination. If you are at the very beginning, enjoy it for the entertainment and the motivation, but build your actual foundations with something slower and more patient, then come back to Fireship once you can keep pace, because at that point it becomes genuinely valuable rather than just fun.