Expired, missing, or invalid SSL certificates.Calls to non-secure 3rd party resources like images, Javascript, and CSS.
There are two main ways that this can happen: While the majority of websites have already migrated to HTTPS, HTTPS sites can still be labeled as not secure. Between Google’s direct negative non-secure site labeling and all of the positive benefits of HTTPS for users, it is a no-brainer for webmasters to migrate their sites to HTTPs. At times, Google has even gone as far as to test marking HTTP sites as “not secure” directly within SERPs. In 2018, Google began marking all sites not using HTTPS as “Not secure” in Chrome.
HTTPS sites provide numerous benefits over HTTP for internet users, including: It is an internet protocol that allows for the secure flow of information between a server (website) and client (whoever is accessing the server). HTTPS stands for “Hypertext Transfer Protocol Secure”.
