On finn theres said ignore play restrictions what does that mean.. can u play weapons for free?

No you cannot play weapons for free. Play restrictions means things like "spot a red character" or "red character" only.

So, for example, Finn can attach Lukes Lightsaber which is otherwise "blue character only", paying its full cost.

I note you're posting a lot of questions here, and trying to understand the game better is a good thing, however I suggest you peruse the Rules Reference Guide if you have not already done so, as it answers many of these questions.

Here is a direct link to the PDF of the full rules reference, it has much more detail than the pamphlet that came with the starter pack. Hopefully this will help.

Also based on your posts I'm going to assume English is not your first language? I have spent a bit of time on google trying to see if the Rules reference is present in other languages, but it's not showing anything up. Hopefully someone else can enlighten you if there is in fact a translated rules reference in your first language, and where to find it.