Question

Hello! when we have to choose between which mechanism out of SN1, SN2, E1 and E2 how do I know how to detect if my nucleophile (or base in the case or eliminations) is strong or weak? I know for nucl

eophiles (as mentionned in the vids) that if it has a negative charge it is strong and if its neutral its weak however, for bases how do I know which one is weak or strong. For example MeOH, EtOH etc, Thanks a lot!