Just started looking into this craft and I have some questions.

Something sparked in me to want to learn what goes into this craft, and through my limited researching I developed questions I haven't found answers to yet.

I also tend to be able to understand written information compared to watching or listening to something.

The foil "tape" that's applied to the edges. What is the function of that? It is just something to allow the solder to affix to, or is there another function as well?

Solder - everything I've seen says a 60/40 leaded solder should be used. Is there a reason to not use nonleaded solder?

Glass - I see vendors noting that glass can be fused. Is that aspect important for stained glass crafting or a way to make the glass more usable in different ways?

Painting glass - I've seen some paints that are intended to create a translucent layer to add color to clear glass. Is this a big no-no in stained glass crafting? Would using the paint on glass you plan to solder cause any issues with affixing the solder?

Thanks in advance. I'm looking forward to figuring this out and adding another craft to my toolbag that I'll likely have little time for....but it's beautiful....