Pros 1. You can learn the latest Firebase. It's a really good lecture for beginners. 2. If you look at the lecture list, it's not that big, so it ends just right before you get bored. 2. The lecture materials prepared with Notion are helpful for reviewing or reviewing the next day. 3. I bought it at a discount for the Hangul Day event, but the original tuition fee was okay. Cons The explanation is insufficient. There is no specific and easy-to-understand explanation of why this is here and what kind of output is generated by doing this. I just... say... This is it~ Let's write it! and move on. The explanation is not perfect. In the end, I feel like I'm just taking a dump, so I Google it and look it up myself. (That's how development studies are.) For those who are hesitant to pay: You can't not know React. You have to know it well. You don't have to use complicated JavaScript, but you still have to know beginner-intermediate + the latest. (nullish / spread / async / ternary operator, etc.) It doesn't come up often, but it comes up anyway.