It's always the same with that kind of question.
If you have skills, use them. Maybe with an online job that pays you bitcoins, maybe with a real job where you earn fiat.
When you have no skills, well, it's gonna be hard. Money comes not out of nowhere.
There are a lot of people out there without any skills all wondering how they can earn money.
Those who have found a way won't tell. They don't need the competition.
Precisely it is the skill that will help anyone to make some Btc . It's mostly the freelancing or trading where they bulk of money can be made . Like trading is obviously risky job but with the right skill freelancing can give you multiple projects at same time and you get paid in Btc .
Also for beginners mostly different campaigns and micro task can help them to earn some Btc .
The only possible way of making one bitcoin in one month or so is to have some huge amount of money for investment purpose. You then invest that money into bitcoin and start trading. By doing so, there are chances that you will be able to get one bitcoin in this much short period of time but even then it is not sure that you will be going to have it. Other than this, there is no possible way of doing this.