There is a lot of controversy on this. As a rule you can't tell from one artifact, it's the number of them and their arrangement that matters most. Key to understanding is the Hollywood version is backwards. Usually in Hollywood you take the a stone and remove stuff till you are left with a tool, like whittling a point on a stick. In reality the bits you take off are the tools. What you have in your hand is a core.
This gives you key pieces to look for, cores being high on the list. Cores are distinctive. The process of making many flakes of a similar size off the core creates a regular and distinct size and shape. They are more rounded at one end, the handle, and then it tapers roughly. There are clear angles and planes to cores. You can tell of the knapper was right handed or left handed. Then you have lots of very regular sized flakes and the core they are off. If you are anal enough - a defining characteristic of archaeologists - you can reassemble the original stone from the cores and flakes. You also have work places for this. It takes some work to make stone tools, so you made a batch at a time. So you have small stone tool work stations. Since they were temporary they were just abandoned as is. An archaeologist can sometimes just sit down and pick up where the original worker had left off.
If you Google "Flint Core" in images you can see pics of many.