master

master verb [ T ] uk/ˈmɑːstər/ us
to learn how to do something well

овладевать (знаниями и т. д.)
to master a technique He lived for several years in Italy but never quite master ed the language.
master adjective [ always before noun ] uk/ˈmɑːstər/ us
having the skills for a particular job

опытный
a master chef/craftsman