Hey Mass_u,
Depending on the crash, it may have corrupted data or caused some sort of data loss as a result.
What I’d typically recommend is to open the editor and attempt to discover which of the assets are not working (if any), and then navigate to your Project->Saved->Backups folder and grab those asset backups (if they exist, sometimes they are not created) and copy those into your project’s Content folder. While these may not exactly be the latest version, if the current assets you have are not working then it is definitely the best course of action.
Sometimes, crashes unfortunately can cause a loss of data. What I’d recommend for the future is looking into using source control for any project you are working on so that you always have a fresh backup of your project waiting in case of any data loss such as this.
Have a great day