How to make rpg stats?

I want to make a Stats system, a good example is the leveling system on elden ring, but instead of using runes i want the player to use levels, here are some stats for example that can change the player:

Vitality(Bonus Health); Strength(Like the potion effect but applies to all gear); Dexterity(Resistance from any kind of attack and knockback resistance); Intelligence(This is not really necessary for now.);Agility(At a level of agility the player gets speed for example); etc.

I tried to search on forum for some tutorials but they didn't really help, maybe someone can help me with this task?