The Only One Calculational Method you will need - Increase your puzzle understandings

1. Don’t solve puzzles when you’re frustrated, tired, or uncomfortable.
When you're not in a good mood, feeling tired, or in a place that doesn’t help you focus, it’s much harder to think clearly. You need to be in the right state of mind to solve puzzles well. Being relaxed and focused helps you make better decisions, which also improves your play in actual games.

2. Don’t worry about your puzzle rating.
Thinking too much about your rating can add pressure and distract you from learning. The goal is to improve your skills, not just chase a higher rating. By focusing on understanding the puzzle, you’ll naturally get better, and the rating will follow over time.

Here is one example of how to analyze the Puzzle after solving it, this puzzle rating is around 3500, which I understand might be too difficult for you, but with a solution, maybe it will be clearer

3. Visualize the whole board before making a move.
Don’t rush! Before making a move, picture all the pieces and possible outcomes in your mind. Try to see the entire position clearly and think about what could happen after each move. This will help you get used to calculating deeper and avoiding quick, careless decisions.

4. Review puzzles you got wrong using chess software.
When you fail a puzzle, take time to learn from it. Put it into your chess software, make the correct moves, and write down what you were thinking when you got it wrong. Compare your thoughts to the correct solution and see where you can improve. This will help you learn from your mistakes and get better over time.

Conclusion:
Following these steps will make you a lot better at solving puzzles. You’ll also get more patient in games and avoid rushing into moves just because they look tempting. Instead of relying on quick instincts, you’ll learn to carefully calculate critical positions.