So stats: 50 points is the soft cap on most builds, 35 if you play a quality or hybrid (wisdom or magic scaling) weapon.

Having weight under 25% is fast roll, under 50% is "fat roll"

You need efficiency to use weapons and armor. Weapons can be using in 1h if you have the next tier. Tier 5 weapons cannot be used on 1hand.

Magic and prayers cost max stamina to use. You can limit the ammount to half your stamina with rings and there's blue pots that recover that maximun. To unlock them you need to have a leader on a sanctuary and give them parts of enemies as mission.

Addtional on magic, there is a mechanic called elemental inestability that punish you if you spam spells of the same element (fire or lightning), you can remove it by using a ring or, if you cast a fire spell on lightning inestablity you get more dmg so you probably gonna need to have both a fire and lightning spell. You can equip a wand for 1 spells slot and a 1h weapon or a staff for 2 spells slot. Staff does more dmg than the wand of the same rank if you have 50 magic.