Basel III is the third Basel Accord from Bank of International Settlements. The objective of the Basel III accord is to strengthen the regulation, supervision and risk management of the banking sector. The new rules prescribe how to assess risks, and how much capital to set aside for banks in keeping with their risk profile.

The following articles provide you a good introduction to Basel III (Basel III for dummies).

https://financetrain.com/an-overview-of-basel-iii-framework/

https://financetrain.com/summary-of-basel-iii-what-you-must-know/

https://financetrain.com/basel-iii-is-simpler-and-stronger/

https://financetrain.com/basel-iii-liquidity-coverage-ratio/

Please share more resources that you find on Basel III.