
1. Smoking/eating cigarettes
2. Taking too much medicine, sugar, salt, fat, drinks, etc.
3. Watching porn/pornographic videos.
4. Masturbation or using obscenities.
5. Scrolling through social media all day or checking feeds.
6. Wasting money buying useless (non-work) things.
7. Consuming too much junk food or fast food.
8. Not doing your own work. Showing laziness.
9. Sleeping more than 8 hours.
10. Not exercising or meditating.
11. Being addicted to mobile/PC games.
12. Excessive thinking or worrying.
13. Not respecting everyone. (Piyas Bhai)
14. Staying up late. (Riyaz Bhai)
15. One must love work. The result is not (Tariq Ibne Hasan Bhai)
16. Having no goal in life. (Md. Siddiq Bhai)
17. Disobeying the elders of the family. (Md. Siddiq Bhai)
18. Lack of confidence. (Bibhas Sen Dada).
19. Not being able to mix with people easily (excessive introversion) (Bibhas Sen Dada)
20. Being afraid of challenges or newness. (Rana Bhai)
21. Gradually losing interest or focus on one's goal. (Suravi)
22. Thinking negatively before starting any work. (Suravi)
23. Lying, being arrogant. (Don Sajeeb Bhai)
24. Overthinking about the future (Wahid Bhai)
25. Accepting defeat with little effort (Sakib Bhai)
26. Not being able to be patient in any situation. (Chowdhuri Bhai)
27. Whoever has read it, please suggest one thing.
28. Being afraid of the dark.
29. If you don't learn to recognize people.
30. Lending, borrowing. (Hard work brings wealth, virtue brings happiness, laziness brings poverty, sin brings sorrow.
31. Not being too weak towards the opposite sex.
32. Only finding faults in others.
33. Hanging out with bad friends.
34. Hoping to get something by cheating someone.
35. Having an arrogant attitude in yourself.
36. Leaving work behind, being immersed in imagination.
37. Thinking too much about what I did in the past.
38. Gradually losing interest or attention to my goal. (Sadia)
39. Trying to keep everyone's attention (Rahatul)
Thank you very much to everyone for giving so many responses to this answer. And whoever reads it, will definitely comment on a bad habit, I will edit the answer.

