All classifications must be followed for a perfected prayer, the distinction becomes relevant when determining the validity of the prayer.

• If one fulfils all the Farḍ, Wājib, Sunnah (and Mustahab) acts, the salah is valid and perfected
• If ones misses a Farḍ act, the salah is invalid and must be repeated
• If one misses a Wājib act deliberately, the salah is invalid and must be repeated
• If one misses a Wājib act forgetfully or makes a mistake in the Wājib act, Sajda Sahu (Compensatory Sajda) is required. Once made, the salah is valid and perfected
• If one misses a Wājib act forgetfully or makes a mistake in the Wājib act and forgets to make Sajda Sahu, the salah must be repeated, unless he realises the omission immediately after ending the prayer and has not engaged in eating, conversing or facing away from the Qibla, then he may perform it to make his prayer valid and perfect. .
• If one misses a Sunnah, the Salah is valid without making Sajda Sahu
• If one repeatedly or negligently misses a Sunnah, then it leads to his Salah becoming deficient, however remains valid
• If one misses a Mustahab, the Salah is valid without making Sajda Sahu

In terms of acceptance, that is for Allah عزَّوجل.

The Classification

The Classification of each action in detail when the Farḍ salah alone

1. Standing for the salah in its time – Farḍ
2. whilst in Wuḍu – Farḍ
3. and free from impurities on clothing or on body – Farḍ
4. in a place of prayer that is pure – Farḍ
5. facing the qibla – Farḍ
6. with Sitr covered – Farḍ
7. and the intention to pray X Salah. – Farḍ
8. Whilst standing (Qiyaam) – Farḍ
9. raise hands – Sunnah
10. to ear lobes – Sunnah
11. with palms facing the qibla – Sunnah
12. and the fingers slightly spread out in a natural manner: not too closed, not too open, – Sunnah
13. the feet should be about four fingers apart – Sunnah
14. and eyes facing the place of prayer or straight ahead. – Sunnah
15. Women should raise their hands to their shoulders or close to their bosoms. – Sunnah
16. Make the Takbir-e-Tahrima by saying Allahu Akbar audibly – Farḍ
17. then swiftly place the right palm over the back of the left hand, wrist and lower arm – Sunnah
18. either below the navel or at the navel – Sunnah
19. and place the thumb and little finger around the wrist with the fingers resting on the lower arm, – Sunnah
20. and stand with calmness. – Wājib
21. Women should place the right palm over the back of the left hand – Sunnah
22. and place their hands on their bosoms. – Sunnah
23. Read thanaa – Sunnah
24. Read Ta’awwuz – Sunnah
25. Read Tasmiyyah – Sunnah
26. Read Surah Al Fatiha – Wājib (sunnah in 3^rd+4^th Rakah of Farḍ salah)
27. Say Ameen silently – Sunnah
28. Repeat the Tasmiyyah – Mustahab
29. Recite a Surah, or at least one long verse or three small verses from any part of the Qur’an – Wājib
30. or a chapter from the last 1/7^th of the Quran, – Sunnah
31. with longer ones for Fajr and Zuhr and medium ones for Asr and Isha and short ones for Maghrib – Sunnah
32. and a longer surah in the first rakah over the second rakah – Sunnah
33. and in Quranic order. – Sunnah
34. Say takbir when going down to bow – Sunnah
35. Make ruku – Farḍ
36. with calmness – Wājib
37. and with your back parallel to the ground – Sunnah
38. and legs erect. – Sunnah
39. Grasp your knees with your fingers like a claw – Sunnah
40. and place your eyes between the feet. – Mustahab
41. Say tasbeeh three times. – Sunnah
42. Women should only bend sufficiently so that her hands reach her knees with the fingers kept together and elbows should touch the sides of the body and feet kept together. – Sunnah
43. Rise again to the standing position with your back straight, – Wājib
44. standing with calmness – Wājib
45. and hands at the side. – Sunnah
46. Say Sami’-allahu li man hamidah – Sunnah
47. then say Rabbana lakalHamd. – Sunnah
48. Say takbir whilst going down to make sujood – Sunnah
49. and allow your knees to first touch the ground followed by the hands. – Sunnah
50. Make sujood – Farḍ
51. with calmness – Wājib
52. on a flat hard surface – Farḍ
53. pressing the forehead firmly on the ground – Farḍ
54. then the hard part of the nose – Wājib
55. and then the tip of the nose. – Mustahab
56. And the toes, knees and hands also firmly on the ground – Farḍ
57. with fingers spread apart – Sunnah
58. pointing to the qibla – Sunnah
59. and in line with the ear lobes. – Sunnah
60. The limbs spread apart from each other – Sunnah
61. and toes curled facing the qibla. – Sunnah
62. Recite tasbih three times – Sunnah
63. Women should keep their body close with thighs touching abs and arms close to the body. – Sunnah
64. Rise from Sajdah in to Jalsa – Sunnah
65. saying takbir – Sunnah
66. lifting the face first, then the hands – Sunnah
67. and place your palms on your thighs – Sunnah
68. with fingers pointing to the qibla – Sunnah
69. and spread the left foot and rest on it whilst erecting the right foot with toes facing the qibla – Sunnah
70. and sit till one is tranquil. – Sunnah
71. Women should sit with feet under the buttocks – Sunnah
72. Say Takbir – Sunnah
73. and make sujood again as above (50-63) – Farḍ
74. Say takbir whilst rising for the second Rakah – Sunnah
75. Repeat 26 – 73
76. Say takbir whilst rising for the Jalsa – Sunnah
77. Sit in Jalsa – Farḍ
78. with your palms on your thighs – Sunnah
79. and fingers pointing to qibla – Sunnah
80. and spread the left foot and rest on it whilst erecting the right foot with toes facing the qibla – Sunnah
81. and sit till one is tranquil. – Sunnah
82. Women should sit with feet under the buttocks. – Sunnah
83. Recite the tashahhud – Wājib
84. with raising the index finger whilst reciting ‘Laa’ and lowering it after that – Sunnah
85. whilst forming a circle with the thumb and middle finger and curling the ring and small finger – Sunnah
86. If 2 rakah prayer, recite Darood – Sunnah
87. and Dua’ – Sunnah
88. Say As-Salam – Wājib
89. with Alaykum wa Rahmatullah – Sunnah
90. whilst turning the head to the right– Sunnah
91. looking at the shoulders – Sunnah
92. With the intention of giving salam to the angels (and the people/jinn on the left and right if in Jamat) – Sunnah
93. And then As-Salam again – Wājib
94. with Alaykum wa Rahmatullah – Sunnah
95. whilst turning the head to the left– Sunnah
96. looking at the shoulders – Sunnah
97. and slightly quieter than the first salaam – Sunnah
98. If 4 rakah prayer, then rise for third rakah without delay – Wājib
99. saying takbir whilst rising – Sunnah
100. Repeat 26 – 73 except 29-33, then
101. Say takbir whilst rising for the fourth rakah – Sunnah
102. Repeat 26 – 73 except 29-33, then
103. Repeat 76 – 97
104. If 3 rakah prayer, then rise for third rakah without delay – Wājib
105. saying takbir whilst rising – Sunnah
106. Repeat 26 – 73 except 29-33, then
107. Repeat 76 – 97