This is very informative post about crypto investment.
In the starting (including me) people don't want to invest hard money as they do not trust this system so the best way to get started is by using one of these methods. You don't fear loosing nay investment and only gain and build the trust. This is the best way to get yourself familiar with Crypto.
I have used 3 out of 4. I have not tried Blog with Publish0x

There are 2 more ways:

1. Use https://presearch.org/ as your search engine to earn crypto for each search
2. Do some crypto training on CoinBase and earn some crypto for free. (not available now, but keep an eye as they jeep adding new learnings)