Explore advanced concepts in string theory through this lecture on entanglement entropy. Delve into the work of Susskind and Uglum, examining how string theory might address UV divergences in quantum field theories. Investigate the relationship between black hole entropy and string worldsheets. Cover topics such as n-fold covers, Liu-Polchinski's 1988 work, SL2R/U(1)=H2, Tseytlin's contributions, Type 2 Theory, and the computation of entanglement entropy. Engage with complex mathematical concepts, diagrams, and functions while participating in Q&A sessions to deepen understanding of this cutting-edge area of theoretical physics.