If you have a basic idea before investing, especially how to store it in a safe wallet, I think you can start investing regularly from then.
Learning about safe wallets to store your bitcoin is good and important because at some point you will need to store your bitcoin in a bitcoin wallet, and if you don't know the right wallet to store your bitcoin, you might store your bitcoin in a wrong bitcoin wallet, which could cause you to lose your bitcoin. But I think there are things that are more important to learn than learning about Bitcoin wallets at the beginning of your investment, and they include figuring out if you will have discretionary income to invest in Bitcoin and how much of your discretionary income you will invest into Bitcoin so that you will not invest more than your discretionary income into Bitcoin and end up selling your Bitcoin too early. After you have started accumulating Bitcoin, then you can learn anything you want to know about Bitcoin.
I totally agree with you that there are things that are more important to learn than learning about Bitcoin wallets at the beginning of your investment, that is why i always advise newbies over time that at your earliest stage of your Bitcoin journey it is always advisable to learn everything that you needed to know about Bitcoin investments before being in a hurry of selecting a wrong wallet that you can use to store your Bitcoin because Bitcoin is not what you can practice what you don't have the full knowledge about and money is involved on the process, so to avoid losing of money on the process of practicing what you don't have knowledge about is better to learn how to store in a safe wallet than losing all your money in wrong wallet.