I'm going to be really honest with you, the most common way to accumulate Bitcoin is through buying it with Fiat, either you have a job in real life that pays you, and thus you use a fraction of your salary to buy/accumulate Bitcoin, it does not mean that it's the only way, but it's somewhat the most assured and popular way of acquiring Bitcoin. Having said that, some people may tell you to try faucets or airdrops, but I'm afraid, you'll earn little or nothing from them, coupled with the fact that majority of them are scams, and instead of you earning, you could end up losing, you can also earn some Bitcoin if you have one skill or the other, and when you offer your services to people, they could pay you in Bitcoin, another means is if you're working in establishments that offer payment of salary in Bitcoin, you can also request to be paid in Bitcoin.