Name the reasons and the occasion of the Hundred Years War. What is the difference between the reason

1. Name the reasons and the occasion of the Hundred Years War. What is the difference between the reason for any historical event and the reason for it?
2. How did the advantages and disadvantages of the Anglican and Fraetzuz armies manifest themselves in the battles of Crécy and Poitiers?

Reason and reason:
The cause of the war is territorial disputes between England and France;
The reason for the war is the claims of the English king to the French throne.
The whole point is that the reason is the purpose of the war, and the pretext is the pretext for the beginning of hostilities.

In those battles, the British were able to utterly defeat the French. Here the skill of the British commanders was manifested. There was also a clear superiority of the English archers. The French mainly relied on heavy knightly cavalry, which at that time began to become obsolete.