I love teaching English. I take it as a challenge to make someone understand. Pushing someone's limits towards English learning is manifests a pivotal role of a teacher. I feel better when someone achieves his learning goals with my help. That makes me feel amazing.
It's been seven years when I decided to become an ESL/EFL/TEFL/TESOL instructor. That allows me to meet people around the world who want to learn that language who are enthusiastic and take it seriously. It keeps me motivated.
1: English is spoken internationally.
2: English is used in Business mainly.
3: English is doubly important to anyone working in an academic discipline.
4: the English language is common in Entertainment.
5: English is salient for travel.
6: This is the most common language on the internet.
7: You can find more job opportunities if you speak English.
8: You can easily travel anywhere in the world.
9: That will boost your confidence.
10: English is specifically functional in Science.
As a native speaker, I would say it depends on one's learning ability and passion for any language.
Also, according to my previous answer, the advantages of learning English and its worldwide popularity and common interests prove that learning English is a lot easier than learning other languages. That's why it is used widely.
When it comes to learning grammar that gets too confusing for non-native speakers, Using slang words formal and informal usage also makes learners overwhelmed. Phrases, idioms, and vice versa. But again I would say it depends because those difficulties and challenges can be encountered in every new language.
Learning any new language asks for endeavor, consistency, adoption, seriousness, dedication, discipline, and commitment from the student side and trust your teacher.