It must start with their research for learning fundamentals of Bitcoin, including how to store bitcoin safely (in open source non custodial wallets with private keys/ mnemonic seeds for full control of their bitcoins), and where to purchase it before withdraw it to their self-custodial wallets (they can do it on CEX, DEX, P2P market places but at the end, their bitcoins must be stored in non-custodial wallets).
It's about research for fundamental but vital things before investment, and a next vital step is how do they manage their capital and related risk for investment. Invest what they can afford to lose, and invest with own money, no loan, no leverage, will help them having better capital and risk management, hence will have stronger hands for holding bitcoin in their investment portfolio.
When entering the crypto industry, we must have a view on how to protect assets and it must be studied carefully so that unwanted things do not happen. After studying, someone can do research on suitability in the form of suitability because to protect assets, one must understand what wallet is recommended. Likewise, when using an exchange as a place to buy, they must understand the level of usage needs within a certain period of time.
Managing investments is indeed very much needed so that people are much more prepared to face risks and the method can be done as you said using your own money responsibly and not forcing someone else's money as a step to start it. When investment is carried out in the right way, it will be much easier for someone to face the possibilities that will occur.
Mistakes can be made by everyone and we all can learn from our mistakes, big or small, but it's very painful if mistakes will be paid by own money or most of capital we have. It's preventable if people are ready to learn and have good preparation for their investment.
Without mistakes we never learn to develop towards new things, but a solution is needed after making an initial mistake in investing so that people can understand the positive and negative impacts much better. Learning will provide preparation for all possibilities and in that way we will be much more prepared.