what is bitcoin, how to invest and how to do business with it?
Over the years this forum has been in existence, I'm certain answers have been proffered multiple times to your questions. Learn to do personal research, use all available tools.
And as a beginner, you should take it slow, start from the very basics, the concept takes a while to fully grasp.
Read articles, watch videos look up online books.
And any specific trouble can be cleared up by knowledgeable members on the forum. Good luck