After a week of classes, for me, the biggest gain was undoubtedly my English ability, especially in writing.
Because there was a report after class every day, forcing myself to express my inner thoughts in English more quickly, I especially felt that I made progress in report writing, unlike the first day when I spent most of the time without much progress.
Using the online method as a way to hone myself, on some levels, really allowed me to learn a lot of things without too much pressure!