To become a Grand Master of Memory -- fewer than 100 in the world can claim that title -- you need to satisfy each of the following in competitions appro...

Modern web app frameworks like React, Vue, and Svelte use a component-based model. Within this model, the most common way to introduce a memory leak is something like this:

window.addEventListener('message', this.onMessage.bind(this));

That’s it. That’s all it takes to introduce a memory leak. If you call addEventListener on some global object (the window, the , etc.) and then forget to clean it up with removeEventListener when the component is unmounted, then you’ve created a memory leak.

https://web.archive.org/web/20070228193210/http://www.mindtools.com/pages/article/newTIM_10.htm

3. The hundred most common words
   Tony Buzan, in his book 'Using your Memory', points out that just 100 words comprise 50% of all words used in conversation in a language. Learning this core 100 words gets you a long way towards being able to speak in that language, albeit at a basic level. The 100 basic words used in conversation are shown below:

4. A,an 2. After 3. Again 4. All 5. Almost

5. Also 7. Always 8. And 9. Because 10. Before

6. Big 12. But 13. (I) can 14. (I) come 15. Either/or

7. (I) find 17. First 18. For 19. Friend 20. From

8. (I) go 22. Good 23. Good-bye 24. Happy 25. (I) have

9. He 27. Hello 28. Here 29. How 30. I

10. (I) am 32. If 33. In 34. (I) know 35. Last

11. (I) like 37. Little 38. (I) love 39. (I) make 40. Many

12. One 42. More 43. Most 44. Much 45. My

13. New 47. No 48. Not 49. Now 50. Of

14. Often 52. On 53. One 54. Only 55. Or

15. Other 57. Our 58. Out 59. Over 60. People

16. Place 62. Please 63. Same 64. (I) see 65. She

17. So 67. Some 68. Sometimes 69. Still 70. Such

18. (I) tell 72. Thank you 73. That 74. The 75. Their

19. Them 77. Then 78. There is 79. They 80. Thing

20. (I) think 82. This 83. Time 84. To 85. Under

21. Up 87. Us 88. (I) use 89. Very 90. We

22. What 92. When 93. Where 94. Which 95. Who

23. Why 97. With 98. Yes 99. You 100. Your
    (Extract reproduced from Use Your Memory by Tony Buzan with the permission of BBC Worldwide Limited, © Tony Buzan)