I agree with a lot of points already made.
1 -Take nothing for granted, a company can be thriving one minute and gone the next. So, take money out of your account as soon as you can rather than building it up.
2 - If you don't need to use the money for day-to-day expenses, use the extra money you earn to create a passive income stream - I invest in index funds within my ISA.
3 - Finally, never pay to take part in anything. It is seldom worth it and often is just a scam.
I don't know what others think, but I feel that online money-making is pretty hard at the moment. Lots of platforms that used to be quite lucrative are now quiet or have so many users that the work/surveys go as soon as they appear.
With regards to making money on youtube, it is anything but easy unless you are incredibly lucky. Based on my child's experience, there is a lot of hard work involved including regular interaction with your audience and you need a niche plus original content.