Having the basic knowledge about Bitcoin is what we need to kick start investing in Bitcoin, while learning other things with passage of time. If you consider learning all about Bitcoin before you start investing you will end up not investing and it will cost you spending lot of time you could have use to buy Bitcoin because the knowledge about is so vast that even an older investor doesn't know it all, it is best you get the fucking started with the basic knowledge while learning other things along the line, Bitcoin is still a growing asset, there are alot to learn getting in to the field when you starting investing.
Exactly it is mostly best to start with just basic ideas especially with Bitcoin. If we try to learn everything before we invest we might never start and we could miss out many chances. Bitcoin and how it works are always changing so even people who have invested for long time are still learning new things. We should learn main things first and then learn more as we go. It is like learning to swim we do not need to know all science of water to get in and start swimming. You are also right that Bitcoin is still becoming more popular and there is much to learn as we start investing. It is like learning adventure.
I don't know why people feel they should know everything about Bitcoin before they start their investment journey, no doubt that it's good to know about what you are getting involved in but with Bitcoin the knowledge you need isn't some kind of complex knowledge as you can just know the basics and then have all the basics set up available like
1. Atleast a job
2. Money used for investment should be your discretionary income
3. Have a back up emergency funds
4. A strong principle of continuing what you started
Basically just know that you are going to just buy little by little if you are not strong with your finances and the best method is by DCAing your purchase and ofcourse learning and also diversification of methods is a welcomed idea if the tools are available and just continue with the basics steps and before you know you have gotten something big from the little you started.