difficulty;

challenge

story of someone's life written by that person

category;

type

the act or result of performance;

how well you do something

sure;

absolutely certain;

determined

delicate skill;

exquisite grace

something that is a basic part or principle;

an essential;

the basics

of a group or class that is considered the very best;

the best

to give to;

to put into;

(usually of time, money, or attention)