1- Use the following link to visit the website of yahoo finance https://finance.yahoo.com/

2- Search for 10 companies of your choice and download their respective historical data while setting frequency to monthly and setting the time period to 5 years (60 months of historical data).

3- Clean your data and aggregate them in one excel sheet to work on the companies as a portfolio.

4- Find the respective average returns, variances and standard deviations.

5- Construct correlation coefficients and covariances tables.

6- Calculate the portfolio's mean return and standard deviation.

7- Activate and use Solver to find the optimal weights for the minimum variance portfolio.

8- Repeat step number 7 over multiple (3 to 4) iterations while setting your objective to a specified level of portfolio return.

9- Construct the investment opportunity set of your portfolio.