Ritically analyse the relevance of portfolio theory and the capital asset pricing model

Your essay must focus on theoretical justifications as well as practical considerations.
You must demonstrate reading and research well beyond the material discussed in
lectures. Your essay will benefit from the inclusion of insights from academic and
practitioner research. Support your arguments with examples .
support the essay with graph and equations
there are some sources follow i want to ues:
Cuthbertson, K. and Nitzsche, D. (2008). Investments, 2nd ed. Wiley [main text]
Bodie, Z., Kane, A. and Marcus, A.J. (2008). Investments, 7th ed. McGraw-Hill.
Elton, E.J., Gruber, M.J., Brown, S.J. and Goetzmann, W.N. (2007). Modern portfolio
theory and investment analysis, 7th ed. Wiley.
Kolb, R.W. (2003). Futures, options and swaps, 4th ed. Blackwell.