If you have original, quality content on a site, you also have a chance of generating inbound quality links (IBL). If your content is found on other websites, you will find it hard to get links, and it probably will not rank very well as Google favours diversity in its results. If you have original content of sufficient quality on your site, you can then let authority websites – those with online business authority – know about it, and they might link to you – this is called a quality backlink.
A poor 404 page and user interaction with it, can only lead to a ‘poor user experience’ signal at Google’s end, for a number of reasons. I will highlight a poor 404 page in my audits and actually programmatically look for signs of this issue when I scan a site. I don’t know if Google looks at your site that way to rate it e.g. algorithmically determines if you have a good 404 page – or if it is a UX factor, something to be taken into consideration further down the line – or purely to get you thinking about 404 pages (in general) to help prevent Google wasting resources indexing crud pages and presenting poor results to searchers. I think rather that any rating would be a second order scoring including data from user activity on the SERPs – stuff we as SEO can’t see.
Every page on your website should have a title, a subtitle and so on. When search engines scan your website, they’ll understand your content better if you explain them the text hierarchy. The most relevant part is the title of your page and you should define it as H1 (in the Text’s Editor). The H1 should be descriptive the page’s content and you shouldn’t have more than one H1 per page. Choose carefully and don’t forget to include your keywords. Following your H1, is H2, H3 and so on. The clearer your text structure is, the easier search engines will digest your site’s content.
First, let's discuss why you even need a webpage in this day of social media domination of the web. On a personal level, you wouldn't want to send prospective employers to your Facebook page, so a personal website makes more sense as an online, customized resume. Another reason worth consideration, for both personal and business sites, is that building your own site gives you endless design choices. You also have total control over products and services you may sell and how they're delivered.