ONLINE REFERENCE AND RESEARCH TOOLS FOR CHINESE:
Chinese Dictionary -- https://www.mdbg.net/chinese/dictionary
Characters Study -- https://dictionary.writtenchinese.com/worddetail/zhong/102/1/1
Grammar --https://resources.allsetlearning.com/chinese/grammar/Main_Page
Multi-Level Reading Materials -- http://www-personal.umich.edu/~dporter/sampler/sampler.html