This document discusses challenges that ESL students may face and provides teaching tips based on Universal Design for Learning (UDL) principles. It notes that ESL students will have varying proficiencies in reading, writing, speaking and listening skills. It also addresses issues with online translation programs and differences in students' cultural background knowledge. Teaching tips include providing information in multiple formats, checking for understanding, using simple language and examples, encouraging thinking in English, reviewing vocabulary, and addressing cultural differences sensitively.