You want to write fiction. Or perhaps you’ve written a novel and an editor has told you that your novel needs work. One of the easiest ways to improve your fiction is to help your readers to engage fully with your story, so that your readers to experience what your characters experience. You do that via your descriptions.
A tip — in your first draft, just write. Focus on what you want to achieve with your descriptions in later drafts. Invariably, writing good descriptions depends on thought. In your first draft, you’re discovering your story. You can only shade and color your story by working with your descriptions in later drafts, when you know the story you want to tell.