KEYWORD RESEARCH – CÁC CÔNG CỤ HỖ TRỢ NGHIÊN CỨU TỪ KHÓA – Google Keyword Planner https://adwords.google.com/keywordplanner – Google Trends https://trends.google.com/trends/ – Keyword Tool http://keywordtool.io/ – Uber Suggest https://ubersuggest.io/ – WordStream http://www.wordstream.com/free-keyword-tools – Moz Keyword Explorer https://moz.com/explorer – SERPs Keyword Research https://serps.com/tools/keyword-research/ LINK ANALYTICS – CÁC CÔNG CỤ PHÂN TÍCH BACKLINK – Ahrefs https://ahrefs.com/ –