Unresolved❗ Grimoire's "If" statments help

Can someone please give me an explain for each "If" command so I can use Grimoire perfectly?
Thanks.

There nothing to explain individually IF the statement is true -for example if number of player in room is less than x- it will execute the next line -for example join escherion-, combining two different lines into one you can make "if the number of players in room is less than one rejoin the room", if it isn't true it will simply skip that line.