Let me be honest here: English is not my first language.
I never nor will ever claim my English command is excellent, except in my resume and when I do pro-bono teaching for school teenagers.
Yes, we can speak fluently, we can argue concisely in the language, but never underestimate the rigorous work required when we do scientific and academic writing. As a non-native speaker, we are proned to make mistakes. However, it is possible to become superbly proficient writer in the second language. I have a few friends who really are. It requires a lot of trainning and practice, time investment, a lot of mistakes being corrected and abundant (loadssss) of reading.
In this section, I will be sharing some common mistakes in writing specifically the one usually faced by non-native speakers. They may be small issues, but if being done repeatedly, they will become a big distraction to the reader.
But for those who are looking for a reliable source, you may go here: Learn English by British Council.