It’s important that you don’t expect your website to suddenly rank highly for your keywords the moment you start an SEO campaign
Whilst adding content regularly and changing product descriptions, and page titles might bring some positive results quickly, it’s not fair to think that your SEO company cam perform miracles.
Even if your website is well designed, the search engines will still take a while to crawl the site and index it. This could take several months, which is why most SEO companies won’t make promises about the sortvof results you’re likely to see. In addition the search engines regulalry change their algorithms, so what might help sites rank today, might not be important tomorrow.
Still, having clean code that makes the site easy to crawl, plenty of well written relevant content, and lots of links is likely to work for most sites.