so if I would like connect $nick with ",", (riotgames,) or google.com/ with "$2" (google.com/howto) how could I do that? For example, I use !search video and bot writes link in chat: "google.com/videos" I know, stupid question, have seen solution before, but I am too stupid to remember

To connect 2 different items you can use the $+ and it'll do it.

Such as

https://google.com/ $+ $2

so !search videos would output
https://google.com/videos