Title is the heading of the webpage. The sentence or string enclosed between html title tag () is the title of your website. Search engines searches for the title of your website and displays title along with your website address on search result. Title is the most important element for both SEO and social sharing. Title should be less than 50 to 60 characters because search engine typically displays this length of string or sentence on search result. A good title can consist the primary keyword, secondary keyword and brand name. For example a fictitious gaming information providing sites title may be like "the future of gaming information is here". A webpage title should contain a proper glimpse of the website. title is important element as an identification of your website for user experience, SEO and social sharing. So have a nice and catching title.
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Description is the full interpretation of your website content and features. Most often it is a short paragraph that describe what are features and information provided by the website to its visitors. You may consider it a advertising of your website. Although not important for search engine ranking but very important for hits or visits through search engine results. Description should be less than 150 character because search engine shows this length of paragraph on search result. And every page of website should contain an unique description to avoid description duplication. Description is the definition of your website for user experience so form it as complete but short and precise illustration of your website.

Meta keywords are keywords inside Meta tags. Meta keywords are not likely to be used for search engine ranking. the words of title and description can be used as meta keywords. it is a good idea for SEO other than search engine ranking.

The ideal page's ratio of text to HTML code must be lie between 20 to 60%. Because if it is come less than 20% it means you need to write more text in your web page while in case of more than 60% your page might be considered as spam.

robots.txt is text file that reside on website root directory and contains the instruction for various robots (mainly search engine robots) for how to crawl and indexing your website for their webpage. robots.txt contains the search bots or others bots name, directory list allowed or disallowed to be indexing and crawling for bots, time delay for bots to crawl and indexing and even the sitemap url. A full access or a full restriction or customized access or restriction can be imposed through robots.txt.

robots.txt is very important for SEO. Your website directories will be crawled and indexed on search engine according to robots.txt instructions. So add a robots.txt file in your website root directory. Write it properly including your content enriched pages and other public pages and exclude any pages which contain sensitive information. Remember robots.txt instruction to restrict access to your sensitive information of your page is not formidable on web page security ground. So do not use it on security purpose.
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Sitemap is a xml file which contain full list of your website urls. It is used to include directories of your websites for crawling and indexing for search engine and access for users. it can help search engine robots for indexing your website more fast and deeply. It is roughly an opposite of robots.txt You can create a sitemap.xml by various free and paid service or you can write it with proper way (read about how write a sitemap).

Also keep these things in mind:
1) Sitemap must be less than 10 MB (10,485,760 bytes) and can contain maximum 50,000 urls. if you have more uls than this create multiple sitemap files and use a sitemap index file.
2) Put your sitemap in website root directory and add the url of your sitemap in robots.txt.
3) sitemap.xml can be compressed using grip for faster loading.

Broken link: a broken link is an inaccessible link or url of a website. a higher rate of broken links have a negative effect on search engine ranking due to reduced link equity. it also has a bad impact on user experience. There are several reasons for broken link. All are listed below.
1) An incorrect link entered by you.
2) The destination website removed the linked web page given by you. (A common 404 error).
3) The destination website is irreversibly moved or not exists anymore. (Changing domain or site blocked or dysfunctional).
4) User may behind some firewall or alike software or security mechanism that is blocking the access to the destination website.
5) You have provided a link to a site that is blocked by firewall or alike software for outside access.
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doc type is not SEO factor but it is checked for validating your web page. So set a doctype at your html page.
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HTML page size is the one of the main factors of webpage loading time. It should be less than 100 KB according to google recommendation. Note that, this size not including external css, js or images files. So small page size less loading time.

To reduce your page size do this steps
1) Move all your css and js code to external file.
2) make sure your text content be on top of the page so that it can displayed before full page loading.
3) Reduce or compress all the image, flash media file etc. will be better if these files are less than 100 KB
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GZIP is a generic compressor that can be applied to any stream of bytes: under the hood it remembers some of the previously seen content and attempts to find and replace duplicate data fragments in an efficient way - for the curious, great low-level explanation of GZIP. However, in practice, GZIP performs best on text-based content, often achieving compression rates of as high as 70-90% for larger files, whereas running GZIP on assets that are already compressed via alternative algorithms (e.g. most image formats) yields little to no improvement. It is also recommended that, GZIP compressed size should be <=33 KB

Internal css is the css codes which resides on html page inside style tag. Internal css is increases loading time since no page caching is possible for internal css. Try to put your css code in external file.