Hero Power is the measure of mastery a person has towards a certain hero in the game. Hero power can only be increased or decreased through rank games or peak tournaments in Honor of Kings. In rank, depends on your performance on the hero, you can gain from around 20-150 hero power per match, the first few matches on that hero (new to hero) having ranged between 500-1000 on high elo. In peak tournaments, you can expect a higher value, from a victorious match gaining 100-300 to 700-1000, where the opponents' average peak rank is higher than your team's.
Status[]
A person who have mastered a hero well enough would have accumulated around 2000 hero power and achieved title Adept (Top 20%), though the amount of hero power needed to reach this status varies from hero to hero. With a little more games and practice, the person could be promoted to Achiever (Top 10%, 3000+).
A seasoned and veteran would achieve Battle Sector Top 5% (4000-5000+), higher pros reaching Battle Sector Top 1% (5000-7000) or even Battle Sector Top 100 (7000+). The highest status is Battle Sector Strongest (8000-12000+). Battle Sector is the continent/region you are playing in. For example, Asia, North America, Europe, Australia, Africa, South America or Middle East. Upon, reaching these status, you would be awarded with badges on mastery respective to your hero power.
However, if you place your location in the game settings, you are also able to see your hero ranking within your city's or country ranking board, provided if you are in it. For example, you can be Indonesia #7, while being Asia Top 1%.
Practice makes Perfect[]
When mastering a hero, it is best to watch tutorials and read about its movesets/combos or passives and stats to learn how your hero work mechanically. However, doing and applying something is the best way we learn, hence try practising the hero in practice or custom mode - or if you want to challenge yourself, go for rank! Learn which items complement your hero best, hero positioning, and strengths. Rewatch and review past matches, and also watch Pro Youtubers play! It takes time, but it will sure pay off! Most importantly, to keep yourself going, have the best of fun!