Hi, how would I go about answering this question best?

Discuss the relevance of the case of Williams v Roffey Bros & Nicholls [1991] 1 Q.B. 1; 53 M.L.R. 536 for the doctrine of consideration.

Also, how would I decipher this question:

"Express or implied agreements to use 'best endeavours' should not be enforced by the courts." Discuss.

Thanks in advance.