Nabi (shallallahu alaihi wa sallam) said: 'Whoever introduces something into this matter of ours that is not of it, it is rejected.' During Haji and Umrah, many practices have crept in over the centuries that have no basis in the Sunnah. Scholars have warned against these innovations, as they can detract from the true worship and may lead to beliefs that contradict the correct creed.
Sheikh Ibn Baz listed several common innovations to avoid: Making doa in a group, where one person recites and others repeat in unison during Tawaf — the Sunnah is individual doa in one's own words. Specifying particular doa-doa for each circuit of Tawaf — there is no authentic doa designated for specific circuits except the doa between the Yemeni Corner and the Hajar Aswad. Touching all four corners or walls of the Kabah — only the Hajar Aswad and the Yemeni Corner are touched. Wiping the Kabah's cloth (Kiswah) and rubbing it on one's body for blessings — this has no basis in the Sunnah. Visiting sites in Mekkah like 'the cave where Nabi was born' as holy places — Nabi never designated these sites for visitation.
Sheikh Al-Albani added further innovations to avoid: Kissing the Yemeni Corner (it is only touched, not kissed). Raising the voice excessively during Tawaf, disturbing others. Reading specific surahs of Al-Al-Quran at the Multazam. Believing that water from the Zamzam well at the Kabah area is more blessed than Zamzam from other sources. Making several consecutive Umrahs from Tan'eem as a formal ritual. The principle is simple: follow Nabi's example as authentically documented, and do not add to it.