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Great recommendation by Donna! I would also recommend the following Professional Online Business Directories (Company.Com, Angieslist, BBB, Yelp, Manta, Alignable, Crunchbase, etc.) Start Writing Relevant Content on Your Niche/Industry/Products etc. then promote and share content/posts. Look out for any opportunities to be  in a resources list or niche directory using the below Search Strings in Google “industry” inurl:directory “industry” inurl:links “industry” intitle:directory “city” inurl:directory “city” inurl:businesses “city” intitle:directory Also, check out https://moz.com/blog/tribute-to-eric-ward which goes over "Link Strategies That Stand The Test of Time"