"All" & "Some"

Valid or not valid...?

To avoid thinking a belief is valid we have to understand what the words "all" and "some" mean and that there are multiple ways to use the two.

All--> "Every single one, no exceptions." Sometimes "Every single one, and there is "at least one." It depends on the argument.

For example:
Being a dancer, I know that, "All dancers dance to music." I can also say "Every dancer dances to music," or "Dancers dance to music," "Everyone that's a dancer dances to music."

Some--> "At least one. Sometimes "At least one, but not all." It depends on the argument.

For example:
Being an employee, I've observed that, "Some workers don't do their job correctly." I can also say "There is an employee that doesn't do his/her job correctly," or "At least one employee doesn't do his/her job correctly," or "There exists an employee that doesn't do his/her job correctly."