Is Redis single-threaded or multi-threaded?

Hello Guys, I've an API that access redis key and updates that key. I want to make that no request access that key while updating. I'm using RAILS app.

How to master Design Pattern in PHP?

Hello Guys, I need to study Design Pattern Solid and Singleton. Anyone has any useful tutorials? Prefer with PHP (Symfony or Laravel). Thanks.

What tech stack Hashnode uses?

What's the difference between Puma and Passenger?

I'm new to ROR and working with Puma and it's fine. But I saw a lot polls like which is the best Puma or Passenger and the results is Passenger.