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I’ve been given the task of optimizing a company’s websites (15 in total) that has multiple websites selling the same product. In terms of optimizing them, can I use the same set of meta descriptions, page title tags and key words for them all or do I need to produce a different set for each? The sites are for independently branded companies that are set up in a franchise-like arrangement. They all exclusively sell the parent companies joinery products

When writing a meta description is it ok to use keywords that are not on the page or site itself?

What’s are best rules around alt tag images for tagging?  is this still relevant for SEO purposes

I’m in the process of developing a website and want to ensure the CMS can have OG tags set up and edit. I was going to add the following: og: type og :image og:url og:description Are there any other open graph tags worth adding in? Also in addition to open graph tagging is there any other social media sites etc that  need to be accommodate for in my CMS, in terms of adding tags?, ie Instagram, Pinterest or LinkedIn.

I work for a company that makes products for the construction sector, we have approximately 80 independent companies who solely sell our products.  We are looking to create websites for each of them (some have pre-existing sites that will be redesigned) They will be reasonably basic with quite few having a single page and none requiring online selling. I’m mindful that we will be essentially optimizing them all for the same words phrases. Is there anything I need to be mindful of when undertaking a project. Is it ok to optimize for the same keys words and  terms etc?