I have been reading a lot and experimenting, but I simply do not get it....

I have a few sensors/switches in domoticz and I can see them without any issue in dashticz, but I really like to reorganize the screen like the pic below...
Can anyone tell me how to do that? I read all the documentation about blocks/columns, tried some of the config.js that some of you posted, but I can not make it work.
Can I use only the config.js to do that? Or do I also have to edit other files like custom.css?
I am not a programmer... Sorry if I am asking something stupid.....

any basic "template" that I can use to show more or less what I want?
Tks for the help!