Sentences. The building blocks of every work of copywriting ever made. Writers are often advised how to work on their craft on a structural level (organization, format, genre) but the detailed work that goes into the crafting of a sentence is sometimes overlooked. A work with impeccable organization will shine, but a work with impeccable organization and beautiful sentence structure will blow people away. So practice crafting a sentence. Practice inserting facts, evoking emotion, creating imagery, and making promises with your writing. And check out copyblogger to find more on how to work through each of those steps.