Get a job and buy Bitcoins. Simple as that.
This is the most simple guide and I do not know why there are still many people keep desperate about have no ability to earn Bitcoin. You can easily find a job in the physical world and use your salary to buy Bitcoin. There are likely a thousand places and people for you to convert you Fiat into whatever cryptos you like
Investing your earned money in bitcoin is a risk due to high price fluctuations associated with bitcoin and many people with middle class background may not want to take this risk.
There is also people who do not have extra money to buy bitcoin and therefore they look for ways to get it for free which is not possible anymore.