Not really an article just made 4 NFTS for the first time and its super easy! Just make sure to do it when gas is low! Also if you like my NFTS please consider picking one up!
You can upload singles or mutliples. 
Link Web3 Wallet, and upload.
NFTS are under the collectible section of your wallet.
"A non-fungible token (NFT) is a special type of cryptographic token which represents something unique; non-fungible tokens are thus not mutually interchangeable. This is in contrast to cryptocurrencies like bitcoin, and many network or utility tokens that are fungible in nature."
Rarible Market Link: https://app.rarible.com/jackmn777