A page can use HTTPS and still offer a terrible deal, misleading advice or a fake sign-in form. The connection and the intentions of the operator are separate things to assess.
What the browser checks
With a properly validated HTTPS connection, the browser establishes an encrypted channel and checks a certificate for the requested hostname. That helps protect the exchange from interception or modification along the network path.
It does not certify the quality of a product, the truth of an article or the fairness of a refund policy. A legitimate certificate can belong to a domain you never intended to visit.
Read the address, not just the page
Before entering an account password, look at the hostname. A familiar logo inside the page is easy to imitate. If a message brought you there unexpectedly, open the service using a known bookmark or its official application instead.
Pay particular attention when a page asks you to act urgently. A countdown does not make an unfamiliar destination more trustworthy.
Treat warnings as useful information
A certificate warning means the browser could not complete its normal checks. Do not bypass it just because the page looks familiar. Confirm the address and, if needed, use the service’s established support route.
On managed work devices, follow the organisation’s instructions. Network configuration and installed trust settings can affect how connections are inspected.
Use more than one clue
For an unfamiliar site, examine who runs it, what its terms actually say and whether independent sources support its claims. For a purchase, check the details before entering payment information.