Using zero conditionals to write about something that is always true.
Notes on use and forms, with interactive exercise - 10 multiple-choice questions, with answers.
CEFR Linguistic competence - grammatical accuracy:
Uses reasonably accurately a repertoire of frequently used "routines" and patterns associated with more predictable situations.
ERASMUS + Competence: Grammar.
National Framework of EFL for Higher Education in Israel: Elementary level.