We have listed links of various lists of dictionaries at the beginning. You could try various ones and find which ones are most useful for you. There is some help for grammar and punctuation. Resources for writing are very useful. For those in academia, career advancement requires writing, so it is worthwhile to study writing using these resources.
Resources are available on line to help non-native speakers of English write English compositions.
Writing lessons are even available on line. Some specialize in business writing. Fees vary a great deal as well. It is also a good idea to be familiar with the search engines available to look for information on the Internet. If you are looking for a particular type of information, a particular home page, etc., it is very useful.