A fraudulent website can be made to look identical to a real one. The logo, the layout, the colours, the wording, the little padlock that people were once told to trust - all of it can be copied exactly, because none of it is secret and all of it is visible to anyone who wants to reproduce it. So the instinct many people rely on, that a site "looks legitimate," is not much protection, because looking legitimate is the one thing a fake is specifically built to do. A convincing copy of a bank, a courier, a shop or a payment page can be assembled quickly, and the whole point of it is to be indistinguishable from the real thing at a glance.
The one element a fake cannot perfectly duplicate is the web address itself - the domain in the address bar - because each genuine address can belong to only one owner. So the fakers do the next best thing: they use an address that is close enough to fool a quick glance. A letter is swapped or added, a word is inserted, the ending is changed from the familiar one to something slightly different, or the real brand name is buried in the middle of a longer address where it looks reassuring but controls nothing. To a person who is not looking carefully - and most people, most of the time, do not look at the address bar at all - the page passes. The link that led there, arriving by text, email or a search result, did the work of getting the victim to a place they never chose to go.
This matters most at the moment of entering something valuable: a password, card details, a login. That is the moment the fake exists to harvest, and it is exactly the moment to stop and look at the address, because everything else on the page has been designed to be reassuring. The check is simple and takes a second: read the actual domain, the core part of the address, and confirm it is precisely the one you expect, with no extra letters, no altered ending, no unfamiliar words wrapped around the real name. If it is not exactly right, it is not the real site, however perfect the page looks.
The stronger habit, which removes the need to judge at all, is not to arrive at sensitive sites through links in the first place. Rather than tapping a link in a message or trusting the top result of a search, reach a bank, a shop or a payment page the way you know is genuine - a saved bookmark, the official app, or an address you type yourself. A link can send you anywhere and dress the destination up to look like home; an address you navigate to deliberately cannot be redirected by whoever sent the message. Looking at the domain before you type anything valuable, and preferring your own route over someone else's link, defeats the great majority of look-alike sites, which depend entirely on nobody checking the one thing they could not fake.