How do you know if an electron is withdrawing or donating?

How do you know if an electron is withdrawing or donating?

h

Which group is electron withdrawing or donating?

t

Which is an electron donating group?

p

What is electron releasing groups and electron withdrawing group?

s

How can you tell the difference between EDG and EWG?

:

Which one will be act as electron withdrawing group?

/

What is an EDG vs EWG?

w