Below are some helpful links if you would like to get better with the basic of Riichi Mahjong.
Daina Chiba’s Riichi Mahjong guide on how to play better and efficiently (More than basic level)
Riichi Mahjong Japanese terms
Daina China’s Riichi Seminar 2017
Feng’s & Gabriel’s Intermediate Riichi Strategies Workshop in SMU Dec 2018