What is the difference between a Pillar in Solah and something that is Wajib in Solah?
A pillar or "rukun" in solah is something that if you missed it on purpose, your solah in invalid. If you forgot to do it, then you have to make up for it, replacing with another rakaat and do "Sujud "sahwi" before giving salam. .
A "wajib" in solah is if you forgot to do it, you need not replace it with another raka'at. You just need to do a "Sujud "sahwi" before giving salam.
The 14 Pillars of Solah
Intention (setting the right intention for praying each prayer)
The opening takbeer. Takbiratul Ihram. Saying ‘Allahu Akbar‘ at the beginning of prayer.
The qiyam (standing upright if one has the ability to do so)
Reciting Surat Al-Fatihah (Opening Chapter of the Quran) in each unit of prayer
Bowing (Ruku')
Rising from the bowing position (I'tidal)
Prostrating
Sitting between the two prostrations
The final Sitting (before salam)
Reciting the final tashahhud (in the final sitting)
Reciting As-Salatu Ibrahimiya after tashahud
The first tasleem (saying ‘Asalamu Alaikum‘ at the end of the prayer)
Tuma'ninah = Making certain that each body part assumes the appropriate position, pausing before one moves into another position.
Following the right order in Solah.
The 8 Wajib of Solah
Reciting "Takbir" اللَّهُ أَكْبَرُ other than the first "Takbiratul Ihram".
Reciting سَمِعَ اللَّهُ لِمَنْ حَمِدَهُ
Reciting رَبَّنَا لَكَ الْحَمْدُ
Reciting سُبْحَانَ رَبِّيَ الْعَظِيمِ ..
Reciting سُبْحَانَ رَبِّيَ الأَعْلَى ..
Reciting رَبِّ اغْفِرْ لِيْ ..
Reciting the first Tashahud (tahiyat)
Prerequisites (Syarat) of Solah
Having reached Puberty
Being sane
Knowledge that the time for the Prayer has begun
Purity from Major and Minor impurities (Hadath)
Purity of the body, clothes
Purity of the place of Solah
Performing Wudhuk
Covering the 'Awrah
Facing the Qiblah