There are many galleries where you can be able to buy works of art. Galleries are also places to display the work of arts of many people. They could have their own collection and own them. They store them when they would be kept or transferred to another gallery. But there are those works of arts that are displayed for sale. As one should also live so artists would sell their works. Ohers could become valuable as time pass and others are works of beginning artists.
If you watched the video, it gives you some of the red flags that you should be careful when you will buy your own artwork collection. You would like your piece of art to be the original and no worries after you buy them. That is why when you notice the one emphasized above then you can just transfer to another galley and look for other artworks. The sales talk could be sweet and pleasing but there could be some loopholes so it is better to be safe.
Another red flag mentioned is when paintings are not arranged and they are just on the floor. There could be plenty of reasons why they are just stacked on the floor but it should not be there in the line of sight of many people who enter the gallery. These are some guide so there is also a part of you that could tell if you will buy or look somewhere else before you buy.