I'm a multilingual professional Certified ESL teacher from the USA with +7 years of experience. I have taught many international students at a variety of levels from beginner to upper intermediate.
I want to note that the difficulty of pronouncing specific words or sounds will vary based on your home tongue, referring back to my year of teaching English to numerous international pupils.
Sometimes, second language learners face difficulty during a conversation; they get confused when they want to express their opinion on a topic. As one of the most critical factors, we can mention translating a sentence or a word from the mother tongue to the second language.