Important online writing resources include ______.

The selection of Purdue OWL as an important online writing resource is justified because it is a well-established platform that offers comprehensive writing assistance. Purdue OWL, or the Online Writing Lab at Purdue University, provides a wealth of information on various writing topics, including grammar, style, citation formats (like APA and MLA), and general writing strategies. It is particularly beneficial for students and writers needing guidance in academic writing and formatting, making it a crucial resource for success in academic environments.

Other choices, while they can offer help in various capacities, do not match the specific focus and depth of resources that Purdue OWL provides. Grammarly is more of a tool for grammar checking and writing enhancement rather than a comprehensive resource for learning about writing principles. Reddit Writing Community and Online Forums may provide peer advice and experiences, but they can lack the authoritative, structured guidance that an educational institution like Purdue OWL offers.