DIY, or do-it-yourself, is a method of building, repairing or modifying things without the aid of experts or professionals. While the term has been around since the start of the 20th century, DIY did not really gain traction until its introduction to the World Wide Web in 1990s. Nowadays, you can mostly find DIY in a form of YouTube videos ranging from simple “How to boil an egg?” to complex projects.
Now, I am not saying that these useful channels are a bad thing to happen, I have used them more times that I can count, but their popularity gave rise to clickbait-y, and utterly useless, “hack” channels that only exist to earn money without regard to whether their DIYs or hacks help people (spoiler, they mostly do not).
YouTube channels such as Troom Troom or 5 Minute Crafts often show “short hacks” that will supposedly make your life easier, but in reality, they take up much more time and you destroy one thing, sometimes even more important, than the one you were trying to make or fix.
Larger projects, such as building your own furniture, or outdoor projects, can also cost a lot of money. Unless you enjoy making your own stuff (and are at least a little competent at it), there is no reason not to pay a professional to perform a service that will probably cost you less overall and will (most of the time, if you use a trusted company) bring a better result.
Not to mention, you can seriously hurt yourself while DIYing. Most common DIY injuries are accidentally cutting the skin, hitting yourself with a hammer, and tripping over materials. While these can be avoided, why risk injuring yourself for a result that has no guaranteed results.
These are just some of my thoughts about DIY and the channels that exploit the idea for views and money. My advice is that you find a trusted channel and use it only for basic things, then slowly expand on your skills with the passage of time.