What are your walls made of? In many cases, the answer will be drywall. While drywall is very convenient for building a home, it isn’t ideal for hanging items on the wall, especially something heavy like a large picture, mirror or TV.
While the best way to ensure that things you hang on the wall stay up is to find a stud and attach them to that, this is not always a possibility. The next best option is to use an anchor. There are, however, many different types and designs of anchors, and choosing the right type is very important. If you use an anchor that isn’t made to handle the weight you put on it, you might have things falling off the wall, which could end up costing you quite a bit of money if it is a TV or something similar. On the other hand, using a larger anchor than you need would make unnecessarily large holes in your wall that would need to be patched up in the future if you were to move.