Holy Water creation, costs the same + spell slot over buying it for 25Gp. Why?

Overchannel, can a wizard maximise damage on Cantrips all day long?

Can a Beast Master Ranger’s Companion act independently?

When one disengages, do you disengage from a specific target or everyone?

When making your player character, do you come up with the character first then the race/class stuff; or choosing the race/class stuff then making a character around that?