There is video instruction which is worth watching and worth paying for. Even if the information is on YouTube, you have to watch a lot of junk and also see many things repeated. A properly designed video class builds information so you can build a good skill. And there is some material which is on a higher level and can't be presented in short form and doesn't tend to make it on YouTube.
There is also plenty of material for sale which is not worth watching for free .
My rule of thumb is watch what the person has out for free. If they say they are going to teach what you are interested in, don't be fooled yet. Watch enough that you actually learn something substantive. Why? Because my experience is that those who "talk about what they will teach you" instead of "launching into teaching because they have so much information to get through" are big on sizzle but short on steak .
The great majority of material on lighting tends to rehash the basics (this is hard light, this is soft light, this is feathering, key, fill, hairlight, background light, basic lighting patterns, strobe vs ambient, etc) which you can, indeed, get well (or poorly) delivered for free. Most of the Photoshop stuff is either pretty basic, a bad practice you should avoid or some cool trick which has narrow application. There are a few with good business advice (but also plenty with questionable advice there, too).
But if you search a bit and use my rule of thumb, there are some worthy investments. And a useful class can save you a lot of time. If you don't invest the effort to practice the skills, you won't gain much, because most of what moves you forward is practice. Good classes just make your practice more efficient or help you better direct your practice.