You’re not specific enough so it will be impossible to address your issue, there are a lot of tutorials online, go to drupal.org and find the resources for beginners.
Also you need to have some form of idea of how a local server works, you don’t really need to go into details, start to understand the general workflow of a PHP application such as Drupal. Find tutorials about basic PHP, local servers etc…
It doesn’t seem that your problem is Drupal related by the way. Not working the next day would seem to point to your local server settings, something as basic as not starting it for instance.
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solved DRUPAL problems