If theres a problem with the server or file system, then one of the most common problems one can face is theHTTP error 500 WordPress. For this, there can be various reasons, so its important to find the root cause to fix it effectively. One of the most common solution that one can try is increasing the memory limits. The host and WordPress set these limits so you can only go high as the limit done by the host. One of the causes can be faulty plugins or themes. To fix this error, you can deactivate the plugins. Many times, recently installed themes or plugins can cause you this error. Make sure to deactivate your plugins one by one to find the faulty one. If you still need assistance with this sort of error, then try speaking to your host.