Ablution(wudu) is an act of washing expose body parts. To get physical cleanliness and purity to offer Namaz. No prayer is acceptable except wudu. So it’s essential to know how to perform ablution. Allah جَلَّ جَلَالَهٌ says in the Quran.
O, believers! When you rise for namaz, wash your faces, your hands up to elbows. And wipe your heads and your feet to ankles, and if you are under a committed to perform a complete ablution, then wash (yourselves) and if you are ill or on a journey, or anyone of you come from the toilet, or you have touched the women. You cannot find water, betake yourselves to pure earth and wipe your faces & your hands in addition to that, Allah جَلَّ جَلَالَهٌ does not desire to put on you any difficulty. Still, He wishes to purify you and that He may complete His favor on you, so that you may be grateful.
Surah al maida[5;6]
Wudu has four Farz(obligatory acts) as well as thirteen sunnah.