There's no way to mine bitcoin for free; it's kind of hard to do. You have to make up your mind to try to invest in bitcoin if you do know more about it and the risk on it because you still have to be aware of the risk it takes while buying bitcoin, so i think that is the key. You can't just decide or think that you can earn bitcoin without any investing in it; typically NO it cannot be possible by this point.
There is no way out to earn free Bitcoin but with struggle and dedication towards job. There are several ways to earn money through cryptocurrencies, such as Bitcoin. Among the others, one easy strategy is to buy Bitcoin and hold it in a digital wallet for a long time to earn a marginal profit. Regular trading of cryptos, i.e., Bitcoin, speculatively while monitoring the market situation is another way. Some cryptocurrency platforms offer affiliate programs or referral bonuses. By referring new users or customers to these platforms like Bitcoin, you can earn a commission or rewards based on their activities. You can offer your services or expertise related to cryptocurrencies to different traders for marginal profit. It must be kept in mind that these methods carry their own risks and require thorough research, understanding, etc.