When writing essays, you will want to take advantage of these built-in tools for checking spelling and grammar.
Proofreading Support Tools
Writing Support Resources in Word and Google Docs
Spell check and grammar suggestions in Microsoft Word
See this article for info on using the grammar and spell check tools in Microsoft Word.
Spell check and grammar suggestions in Google Docs
See this article for info on using the grammar and spell check tools in Google Docs
Using Grammarly and other third party editing resources
There are many AI-powered editing assistants available on the market to support you in composition. Grammarly is one such service which is gaining in popularity. Grammarly is a subscription service with many features available under a free subscription plan. You can find info on Grammarly at grammarly.com. You can see a tutorial on using grammarly here.
There are also a wide range of other editing support tools such as Wordtune, ProWritingAid, and Sapling, to name but a few.