<title> Title
<meta keywords> Keywords
<meate description> Web Descriptive narrative
Semantic code
H1~h6 tags more for headings
UL tags for unordered lists
OL label more for ordered list
DL tags are used to define data lists
EM, strong to emphasize
<a> tags
<p> tags and <br> tags (only for text spaces)
Defining tables with Caption
labels should use ALT to explain
<strong> used to emphasize,<em> for italics and <b><i> labels
Important content HTML code on the front
Important content do not use JS output
Use the IFRAME framework as little as possible
careful use of display:none; (The search engine will actively filter out, the spider will ignore the content here)
The more streamlined the code, the better the clearer the better (the hierarchy of more than three layers of spiders do not want to climb again)
The number of home links (small and medium sites within 100, page navigation, bottom navigation, anchor links, etc.)
Web page code optimization