Scala can be downloaded and installed on either a Windows or NIX platform (e.g. Linux, OS-X) here. For this lecture you must install Scala 3, and we recommend installing it using Coursier (see the previous link)
One of the most widely used IDE (Integrated Development Environment) for Scala is:
OPTIONAL: Puteti instala extensia Error Lens pentru Visual Studio Code, aceasta va arata erorile direct pe linia de cod unde e problema si va poate ajuta.