See this is the problem with most of us that we want Free but we must always realise that nothing in this world is free but it always has hidden cost behind it and we should not fall for these things.See as a suggestion I would say that as you are looking for some free bitcoins then you would find lot of scam advertisements and links with these lucrative titles but they are attempt to steal your funds or data so don't click on them as you could see at this time it's around $20k so there won't be anyone giving you free sats also.

Some of the legit ways to earn bitcoin these days as suggested are by @Welsh like mining and investing but if you are interested in some other ways :

1) Sell your goods or services in return for bitcoin payments

2) Take your salary in it as a portion if your employer is happy with it and don't have any problem

3) You can try to join some projects if you have those skills and earn some bitcoins this way

4) There are few campaigns on the forum also but you need to go a lot like knowledge perspective and rank up on the forum

But if you say without knowledge, investment or mining you can earn some free bitcoins then you are on the wrong move so you need to understand and evade this approach of earning bitcoins.