What is the best website builder for light websites?

You can try Elementor https://elementor.com

Once you start building a website, you realize you want it to be more complex than you though. Try WordPress (choose theme that's compatible with WPBakery plugin, and you can build it in no-time.

Well, there tons of builders outside. I tottaly agree that elementor or some wordpress themes will fit for basicly any type business. Of course you'll have a learning curve (if you never used this before) but it will makes a huge difference when you start to grow. It will have payments? Lead capture? Costumer chat? etc. If you want use something without many features, you can take a look at Leadpages or Versoly.

It depends on the website. Wordpress (offered by many website hosting companies) and Squarespace.com are very popular options.

I am using wordpress on last couple of years. Could you please suggest something for lite websites? Speed is priority.

In my opinion WordPress is the simplest and the easiest. If you do know anything about programming, this is very goodand usefool tool.