familiarity with (something)

Translations
знакомство с (чем-то)
His familiarity with the software helped him complete the project quickly.
Его знакомство с программным обеспечением помогло ему быстро завершить проект.
Definitions
A level of knowledge or experience with a particular subject, object, or situation, indicating that one is well-acquainted or comfortable with it.