You've definitely seen something that you really liked at that moment, but after buying it you realized that you absolutely didn't need it and that it was actually just a waste of money. This phenomenon is called impulse buying.
What is impulse buying?
It's basically the same principle as when you go shopping hungry and suddenly bring home only things that are ready for immediate consumption. Stores naturally use this method, which is why you see prominent signs with the word "sale" everywhere.
How it works:
Stores are actually just trying to get your attention with the assumption that you'll take this or other goods home. And with words like sale, limited edition, or temporary offer, they're actually putting you in a stressful situation where you see buying goods as the only way out.
Psychological tactics of stores
Luxury and premium brands are particularly known for this tactic, where their staff in stores might even be unpleasant to you, in order to attack the ego of their target customers. It's all really just a psychological game.
How to avoid impulse buying
3 days to think it over
One way to avoid impulse buying is to give yourself 3 days to think about it. After this time, it should be clear whether you really need the product.
Online cart - leave items for 2 days
When shopping online, first add products to your cart and leave them there for the next 2 days. Then come back to the shopping cart and decide whether you still want the product. It's quite likely that you only wanted to order the product because of the dopamine rush from shopping.
Set a lower daily limit
Set yourself a lower daily limit for payments. Keep the limit only high enough to cover essential items. Then, whenever you want to buy something like this, you'll have to change your payment limit each time, and out of laziness you'll rather give up on the unnecessary product.