Optimize all pages?

This may be a really stupid question, but is it important to optimize all pages on a website as much as possible? I am new to this and have worked hard at optimizing my home page but have realised that I have slightly neglected my other 26 pages. Will this affect my position in google?

Do onpage optimization on all your web pages and not just your homepage

On site optimization should be done to all pages. Fairly easy if you use a template, and spend time on each page tackling specific keywords that are most relevant to each individual page.

Off site optimization should never end and be applied to all your pages if possible. Specifically the most important ones that direct your visitor to convert. The stronger your inner pages are, the stronger all your pages are, especially the more popular ones and your home. Think of your pages as climbing a pyramid in Egypt. Those big blocks are a lot easier to climb up with help from a friend. If all of you are working together, you'll get to the top faster. Heck, why not add another strong friend or 2 to the pack.

I spend a lot of time making my deep pages strong by promoting them and building awareness for natural linking. This has resulted in 3 of my pages having more daily traffic than my home page. With the internal linking structure, it makes all of my keywords that more powerful and relevant.

Think bigger. Make every page that means anything to you, and directs traffic to conversion, stronger. Take a tip from Wikipedia (the bastards.) It's a smart site with many strong pages, with a great linking structure. Every keyword in the content carries serious link juice due to its deliberate relevance. And every page develops loads of natural links.

(They're really not bastards, I'm just bitter cause I need to beat them for 2-3 important keywords!)

Yes you should apply SEO to all your webpages. But what I tend to do is optimize different pages for different keywords in your niche.

Your whole site is taken into consideration for each ranking. So, optimizing other pages is important.

And you need to have good, optimized pages on your site in order to link internally to other pages on your site.

I give more importance to product, service and home page and less priority to other pages.

Well, it would always be better if every page in your site was well optimized and be sure that every description and title is unique.

Thank you for the advice, I will work on it.

I have found very good advices from all of you, I do the same thing for all my sites.

Thanks