I am not sure if we have the same understanding on your question "how to choose the correct investment bitcoin?" but I think it is more likely how to choose good coin to invest. I think maybe it is better to first research more about cryptocurrency so you can be familiar with the terms because even me I am not familiar with some terms that I encounter in this forum. In addition, research can also help you determine on which coin you would like to invest to avoid losses. As newbie, bitcoin is a good coin and for altcoins try Ethereum. But again I suggest to conduct research for safer investment.