Iam in the Real Estate selling service business.Pls teach me how i can

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Optimize & Rank my Realty Website? Iam in the Real Estate selling business. I have a Realty website. Pls teach me how i can Optimize & Rank my Realty Website. So that my buyers can easily search my website when they type their Realty requirements at internet search engines. Pls advice steps or ways that my realty website will have a good ranking in the search engine since realty websites runs into hundreds of thousands website and if my website is not optimizes - it might only land on the 150,000th website page of realty websites. Because i notice that some Realty service websites every time i type a property they are always on top of the search engines results. they are either #1 or #2 or #3 or top 10. What are the ways ? Principles ? Steps in Website Optimizing and Ranking without paying a lot of money to SEO companies that promises website rankings and optimizing ? So that i could land at least among the top 10 ? Thank you so much in advance because your advice will really help me in the big competition of realty service.