Some tips to become a pupil on Codeforces:

Practice regularly and consistently. Aim to solve 3-5 problems per day on average. Frequent practice is key to improving skills.

Analyze solutions. After submitting your solution, take time to read the best solutions posted by others. Try to understand better approaches.

Study data structures and algorithms. Having a strong foundation in common algorithms, data structures, problem solving patterns will help tackle a wide range of problems.

Participate in contests. Contests are the best way to train under time pressure. Start with smaller rated contests and work your way up as skills improve.

Learn from mistakes. Don't get discouraged from wrong submissions. Analyze where you went wrong and improve your understanding.

Vary problem domains. Try problems from different domains like strings, graphs, mathematics, implementation etc. to strengthen diverse skills.

Level up over time with ratings. Aiming for Expert or above ratings on Codeforces signals specialist level ability. It takes dedicated long term practice.

Participate in discuss section. Discuss problems with others, exchange ideas and learn new approaches.

Solve problemsets completely. Target fully solving problemsets, even hard problems, to maximize learning from each.

Stay up to date. As sites add new tags and problem types, ensure your skills evolve as well over time.

Wisdom is not eternal answers, but eternal questions that lead to the search for truth and self-knowledge...