Simply by 1. reciting Quranic verses like Ayatul Kursi and Suras like Sura al-Falaq and Sura Annaas. 2. Also by reciting Du'a and supplications for protection from harm. 3. It is also very useful to pay daily Sadaqa for protection from every harm. 4. No doubt, seeking the Waseela of Ahlul Bayt (AS) is always useful.
'Wassalam.