What is the meaning of professional, really? #professional

How do we define a metre? #shorts

IF vs WHETHER /// Many English learners ask /// what is the difference between if and whether /// Let’s keep it simple /// First /// IF /// We use if for conditions /// when something depends on another thing /// For example /// If it rains /// I will stay home /// If you study /// you will pass /// Important /// Whether cannot be used here /// Only if /// Now /// WHETHER /// We use whether when there are two options /// this one or that one /// yes or no /// For example /// I don’t know whether