To build a regular partnership is the most important thing in bridge.

Two advanced players may form a expert pair and two experts may only form a non expert pair.
The most important thing is
to be nice to your partner.

Granovetters wrote a nice readable book "Forgive me partner"

S.J.Simon wrote 1946 a great book
"WHY YOU LOSE AT BRIDGE"
ans it hast lost nothing of his values.
Agree with your partner in the necessary bidding and defensive gadgets.
It is much more better to have an agreement (even if the tools are not perfect) than to have no agreement.