Your advice to start with a small and low profit investment is quite commendable, especially for the newbies. By so doing, one may be able to gain experience and make all the necessary adjustments in their strategy to make sure it suites their investment goals without actually risking too much, plus you get to build some level of confidence in your strategy before levelling up.
I think that this advice is not only for a person that has small capital, it span to any person that doesn't understand how crypto work, this will help you minimize the risk of loss. Something like DCA where you buy small amount at different prices until your capital is all bought or you continue to buy as you have more money in the future, you will see that even if the market dip your loss is going to be minimal.
For example, the market has dip within yesterday and today. We have loss like $10 within this week and I'm sure there is one person that has bought Bitcoin at $100k planing to hold if for long while another person has bought here and hoping it goes down more so they can continue to buy more, that's the advantage of DCA