1. Always look at reviews
The most reliable information you can get, is what other buyers have written about the item. I don't care about the star rating system, because the reasons people have to leave a bad star rating, might be something you care less about. Like long shipping time or longer/shorter than they expected. You simply cannot know! I by the way recommend you to always leave in depth and honest reviews, to help your fellow onlineshopper!
2. Go for items with many reviews
Many items are sold from multiple sellers. Go the the one with most reviews, because lots of reviews usually means lots of people who have recieved their order.
3. Watch hauls on YouTube
My favorite way to find the best quality items, is to watch Asian wholesale hauls. Sites like SheinSide, Oasap, Dresslink etc. get their clothing from the same factories as the AliExpress sellers and you are therefore not "restricted" to AliExpress hauls.
4. Search for the items on SheinSide
As I mentioned in 3., SheInside sell the exact same clothing as what you find on AliExpress, but for triple the price. You can therefore take advantage of their "style gallery" section. Seeing the clothes on real people and non-photoshopped, gives a better idea of the quality and fit.
5. Be aware of the material
Polyester is not necessarily always a no-go, but some things are just not meant to be made out of synthetic fabric. The seller might give you wrong information though, but it is usually not the case.
6. Add things to your wish list
You will then be reminded if the item goes on sale. I've scored many amazing deals this way!
7. Be realistic
If you pay 15$ for a bag, don't expect it to be real leather. Once again, always check the item description.
8. Measurements
Asian sizes are not the same as European sizes. A medium might be the same as a large - and in rare cases, maybe the other ways around! Therefore always check the measurements. Their dresses are often on the shorter side, but rarely so short they cannot be worn.
9. Expect shipping time to be 1-2 months
A lot of people get turned of by this, but it is totally worth it in my opinion. You just have to think in advance. I as an example just purchased a winter coat, even though it's still late summer where I live.
10. Don't buy jewellery
Simply because it's cheaper on eBay.
I hope some of you find these tips helpful. I don't think nearly enough people know about AliExpress, which is a shame. If anyone is interested, I might do a haul/review on some of my recent purchases. Maybe even a lookbook! Let me know in the comments :)