Is there anyone who could help about portfolio for stock investment?

1.What is the portfolio in stock investment?

2.Why need it and how many kinds of portfolios are there ?

3.How to set up or open a portfolio and can we take each kind of portfolio as one account with ID and Password or is it under one account to manage different kinds of portfolios or how to think it in a right way?

4.Is portfolio only for stock market or it could work for other investment ?

5.To invest stock and seed of start-up, should we find a agent about portfolio or how to do ?

6.If we must find a portfolio agent to set it up, what would the fee or charge be and is this one-off fee or continuous charging by rate from agent or from the portfolio provider?