Crawlable Anchors
How do I make a page crawlable?
Seo main factors
What are Crawlable Anchors
Search engine crawlers are able to follow the links of your website exclusively if they use proper <a> tags with resolvable URLs:

How to use <a> tags properly
If a link is an <a> tag with an href attribute, crawlers will be able to follow it correctly; on the other hand, if the format is different (i.e. without an href tag or other tags relative to a link), crawlers will not follow it: this is due to the script events.
For instance, crawlers can follow:
<a href="https://example.com">
<a href="/relative/path/file">
They can not follow:
<a routerLink="some/path">
<span href="https://example.com">
<a onclick="goto('https://example.com')">
Make sure to link to resolvable URLs
You have to be sure that in the <a> tag you are linking to a valid URL, namely that the crawlers can interact with it, such as:
https://example.com/stuff
/products
/products.php?id=123
What is not considered a valid URL:
javascript:goTo('products')
javascript:window.location.href='/products'
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