I just picked one up for my Nintendo switch which is basically a shield. It works great, the one I received has a write speed of 100mbs per second and I believe the shield tops out at 80? This should be perfect!
Yes. This comes with an adapter to convert it from a micro to a standard SD card, which will fit in laptops, DSLR Cameras, Point and Shoots, and any other device accepting a standard SD card
RAM is used to temporarily store data when processing something. Storage is used for long term storage of your programs and files. An example is if you are writing a document, while you are making the changes it is stored in RAM, but when you press the save button it is copied over to storage. The SD card would be storage.