Some general rules that apply for most if not all modules:

• you can trigger them via trigger
• the modules effect stop when it is deleted
• in most cases where a module expects a single synced object, you can also sync multiple in which case it randomly selects between all options or applies the effect to all
• when syncing groups of units it does not matter if you sync the leader, the group, or each unit from a group or anything in between. It is smart enough to figure it out and adds the whole group and avoids adding units twice
• most modules effects follow the module if you move it