5e is a very simple RPG system, based around the maxim that a character sheet must be made of 5 e's, of which four are essentials and one is not.
They can normally go up to 5 (of course), with 3 being average for a young adventurer suitable for military service, and 2 being more typical for a nameless NPC. A beginning adventurer has 12 points to distribute between them, preferably with no zeros. They are as follows:
Endurance - covers brutish feats of strength and stamina. Also, your maximum HP is equal to your Endurance (everyone knows what HP is!).
Elasticity - covers flexibility, the most underrepresented physical attribute in RPGs. But we're also following the fine RPG tradition of conflating agility and flexibility, so to do feats of dexterity and the like, you should also use your Elasticity attribute.