It’s the process of splitting an overly expensive NFT into units so that more people can afford it. Sharding can also convert an NFT to a fungible piece since many people will own it collectively. The word “sharding” originally refers to the process of partitioning (splitting) a large database into subsets.
The short form of “as far as I know”, implying that the information available is what someone knows so far. AFAIK statements are usually amenable