‘At home’ means-

• At home (Phrase)
English Meaning: skilled/comfortable/ confident or relaxed about doing or using something.
Bangla Meaning: দক্ষ, ঘরের মত আরামপ্রদ।

• Synonyms:
- confident with
- proficient in
- used to
- familiar with

• Example:
1. He is at home in English.
2. I never felt at home in Dhaka.

Source: Website Lecture and Oxford Learners Dictionary.