I heard about crypto from a friend. Then I came to know about this forum and since then it has helped me a lot. There are great posts here and people with great knowledge to help us.

You can use the exchanges. But you need to be careful as bitcoin is strictly banned in Bangladesh. It will always be a risk.

I couldn't find the corelation between OP and the title. Anyway, by definition it is showing inflationary characteristic due to price decrease. But when you consider it has fixed asset, you would realize that bitcoin is invariable deflationary.