Does conversing with young people—Arabs or foreigners—via a random app for the purpose of improving English constitute a sin?

Online conversations between genders vary depending on their nature. If they are in a public forum and adhere to Islamic guidelines, such as speaking in a well-known manner and not softening the speech, then there is no harm in them. However, if they are in private chat rooms, they are a pretext for evil, corruption, and discord between men and women, for the Prophet, peace and blessings be upon him, said: "I have not left behind me any trial more harmful to men than women."