My native tongue is Norwegian, so writing English still is a challenge at times, even after years of practice. Apart from the pure typo part, it is a question about reasonably good grammar. The Its vs the It’s. The a/an conundrum, and the handling of plurals and time-related issues, as well as general sentence structure.
I am testing the free Grammarly edition for Chrome, and it is … well, a bit weird, but also better than no checking at all.
However – unless you write for a living, the available price plans for the premium version are rather stiff.