which command will using to delete all rows from table truncate or del

Question

I work on sql server 2017 

i need to delete all rows from table student_course 

but i don't know use 

delete from student_course

or

truncate table student_course

table student_course

studentid pk

courseid pk

table student table

studentid pk

table courses

courseid pk

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  student_course table have relation with courses table and student table

so which command will be used to delete all rows from table student_course

truncate or delete ?