If you're playing ARK: Survival Evolved and you're experiencing crashes, there are a few things you can do to troubleshoot the issue.
First, try restarting your computer and launching the game again. If that doesn't work, try verifying your game files to make sure they're all intact and up to date. You can do this through Steam by right-clicking on ARK in your library, selecting Properties, and then going to the Local Files tab. From there, click on Verify Integrity of Game Cache.
If neither of those solutions work, it's possible that your graphics card drivers are out of date. You can check for updates and download the latest drivers from the manufacturer's website.
Finally, if you're still having trouble, you can try lowering the graphics settings in the game. To do this, open the in-game options menu and navigate to the Video Settings tab. From there, you can adjust the game's resolution, quality, and other settings.
If you're still experiencing crashes after trying all of these solutions, it's possible that there is a more serious issue at play. In that case, you can contact the game's developers for help.