Absolutely, Bitcoin knowledge is not complete without investing in Bitcoin.
Learning about bitcoin alone is already an investment because we don't do it for free. Those times we sacrifice, which could have been used for other things, were invested in learning about bitcoin, which I don't see as a wasted resource. I consider that time as something that was put to good use and could also be considered an investment.
If I don't have money to invest in bitcoin yet, that doesn't make my knowledge a waste. I can still continue to learn more about the currency until I can raise money to start my holding journey, but with the things that I'm able to learn about it, I can still use that knowledge to earn bitcoin without physically investing money in it, which is also one way that the information gotten from bitcoin can be put to good use. There are a lot of ways to actually earn bitcoin; all one needs is to have the knowledge, which is a good starting point, and capital to buy and start holding, which is what follows.
I disagree with you on this oprichuckwu that the knowledge you are gaining is an investment. Investment means when you put money (capital) with the hope to get profit OR you put in money so that the money can increase over time. There is no way you can go to the supermarket and say that because you understand accounting, that you will be given whatever that you want for free. Without money one cannot invest.
Bitcoin is an investment that you don't need too much before you can invest into it. You can even start with as low as $5 to invest, and what I know is that you don't need to know so much about bitcoin before investing. There are such knowledge that are better learnt through experience and not theory, because nobody will teach you how to control your emotions on bitcoin price movement. If you believe in bitcoin and you have the basic knowledge of bitcoin, then I don't see what will deprive you from investing with very small amount in what you believe that has the possibility giving you a retirement funds in future.
It is people that don't have the insight of what Bitcoin will be in future that wouldn't take the advantage to start investing in bitcoin early and they are waiting till they have so much on them before they can buy bitcoin or till when they have understand everything about bitcoin before investing. It is better to invest right away and learn the rest aspect of bitcoin during your accumulating period. DCA strategy is well known as the most efficient method one can use to increase his bitcoin bit by bit.
When you only know the theorical aspect alone, you wouldn't see the challenges and risk in bitcoin investment as a hodler. It is just like someone that says he can drive a car because he knows the theory but hasn't put it into practice, and says he is a good driver. There are some knowledge that a newbie who bought bitcoin will have, and someone that has all the theory knowledge will never have