Hi Abod, I can help you, but you need to book a lesson!

I'm just staying here for a bit. I'm just kipping here for a few days. I'm just sleeping here temporarily. Thanks, friend, for allowing me to rest my weary head a few days at your place, but don't worry, I'll be moving along very soon.

I don't understand why I must to go to the gym to stay fit. If I can do physical exercise at home for that, why other people do nothing for that and they try to explain own laziness 🤔 I don't understand why I need to go to the gym to keep fit. If I can do physical exercise at home then why do other people do nothing and try to make (lame) excuses for their laziness?

"I travelled in 2018 when I went for to u.s.a. I prefer travel of air plane" I last travelled in 2018, when I went to the USA. I prefer to travel by aeroplane. (mas acho que você não entendeu a pergunta corretamente. Não é sobre a última vez que você viajou, é sobre quando você viaja, em geral)

How long is this course?

Some story

Early 20th century. In some Polish house live three sisters, then one of them gets acquainted with the young military and moves with him to Russia . Two other sisters emigrated to the United States, after which one of them became a lover of the President named John Kennedy. Sister from Russia didn't like her life there. She suffered. The sisters helped as could as possible. But she stayed in Russia and had a daughter...
Please correct me

It was the early 20th century. Three sisters lived together in a house in Poland. One of them got acquainted with a young soldier and moved with him to Russia. The other two sisters emigrated to the United States, after which one of them became a lover of President John F. Kennedy (1961-63, not the early 20th century). The sister in Russia didn't like her life there, she suffered. The sisters in the U.S. helped her as much as possible, but she stayed in Russia and had a daughter.

I changed some of your tenses, for consistency.