If anyone can earn 1 BTC without any skills and without any investment, i am sure He/she won't teach the way!
There's no such that you can earn 1 bitcoin without any skills and without investments. This is the impossible thing though I'm not believing there's always a possibility but who on Earth will have this laziness and have a blessing of 1 bitcoin? Oh yes maybe it's possible by someone who has a golden heart and will just give it to him for free.
Without skills and investment you won't be able to get that large sum. Because no one gives something for free.
1 BTC is above 4000 dollars. Which is much higher than the average monthly wage worldwide.
The only way could be gambling and the chance will be closer to none.
Gambling is the closes that you activity to have at least 1 bitcoin. But the risk are too high, you might even lose more than 1 bitcoin is a month if you try to chase achieving 1 bitcoin. You the only thing that will really give you 1 bitcoin is your skills. But with the current price of bitcoin, you need to be a life a beginner to at least mid level programmer to get 1 bitcoin. I know this is achievable is software development but the question is, do you have the skills? Web development now is very booming but without the necessary skills set then it will be very difficult to earn 1 bitcoin in a month or two.