The "Portfolio value" is obtained by adding up the value of the shares you currently own. Right below, you will be able to see the difference in the value of your portfolio since you started investing.

On "Today", you can view the daily difference of your stock portfolio, which takes into account the daily price fluctuations.

You will be able to see detailed information on each stock in your portfolio: number of shares owned, current value of the share, and absolute and percentage change in a stock since you purchased it.