I have a bunch of aspx (asp.net) and html pages. The site is active past 2 years and gets decent traffic. Now all this while, I have not taken care of SEO. So my pages do not have meta tags, description or H1, H2 and so on.
Now I plan to add them to my pages and do this the right way. My question in any way will this negatively impact SEO, like any penalty. Also when Google and other search engines reindex the pages, are there chances they will notice it and rank the pages higher?
Infact every page content is full of inline JS and CSS, which I know is wrong. I plan to remove them to an external file. The actual content is also way below.
Do you know of any other similar tips for ASP.NET 4.0 or HTML sites?