Ideally better to learn the concept and use of the bitcoin first before making their move as an investment. This is common mistakes of the newbies or newcomers nowadays once they seen there are large names right there makes good return with their investment it caught their attention and then wanted to try at the same time just two possible outcomes here.
It's good to start with buying small amount of bitcoin for practice of not only buying, but also making withdrawal from a centralized exchange to a non custodial wallet, how to choose and use a non custodial wallet including wallet backup and wallet recovery. It can help people to practice, and get familiar with Bitcoin, exchange, blockchain, wallet and can minimize their losses if making mistake in early practice.
When they are already familiar with these things, they can start their investment with bigger capital, and make more purchases as DCA for their investment portfolio accumulation with time.