For protection from ignorance - 1
أَعُوذُ بِاللَّهِ أَنْ أَكُونَ مِنَ الْجَاهِلِينَ
Aoothu billahi an akoona minal jahileen
I seek refuge in Allah from being among the ignorant.
Surah Al-Baqarah - 2:67
Supplication
For protection from ignorance
1 dua with Arabic, transliteration and translation.
Each dua is shown with its reference where the source records one, so you can check it. Duas whose wording you intend to rely on in worship are worth confirming with a qualified teacher.