There are three different types of Hajj namely:
Hajj-ul-Ifrad.
Hajj-ul-Qiran.
Hajj-ul-Tamattu.

Tawaf-e-Qudoom is the first Tawaf performed upon entering Masjid al-Haram by those performing Hajj Qiran or Ifraad.

It is also known as the Tawaf of arrival.

There are seven types of Tawaf;

1.      Tawaf-ul-Qudoom:

It is performed when a person arrived at Makkah whether for Hajj, Umrah, Business or a visit.

2.      Tawaf-ul-Ziarah:

It is also called Tawaf-ul-Rukn or Tawaf-ul-Hajj. It is performed by all pilgrims who are undertaking the Hajj. This Tawaf is mandatory

3.      Tawaf-ul-Wada (Tawaf-e-Sadr):

It is a farewell Tawaf and performed as a final ritual of Hajj when a pilgrim leaving Makkah.

4.      Tawaf-ul-Nafl:

Tawaf-ul-Nafl is an optional tawaf but it is better than performing a nafl salaat. It can be performed at any time and as desired.

5.      Tawaf-ul-Umrah:

Tawaf-ul-Umrah is a part of Umrah and performed as a ritual of Umrah. It is obligatory for the one who performs Umrah.

6.      Tawaf-ul-Nazr:

If a person pledged that he will perform Tawaf if his desire is fulfilled by Allah. Then, he must have to perform this Tawaf if Allah fulfills that desire.

7.      Tawaf-ul-Tahiyaah:

After Tawaf, the person has to offer two units behind Maqam-e-Ibrahim (if possible, otherwise they may offer that two units prayer anywhere in the mosque).

Tahleeq (تحلیق) refers to the act of shaving or trimming the head as a ritual during Islamic pilgrimages, particularly Hajj and Umrah.

Quranic Reference:

"You will surely enter the Sacred Mosque (Masjid al-Haram), if Allah wills, in safety, with your heads shaved and [hair] shortened."

— Surah Al-Fath (48:27)