Long payment IDs are obsolete.Long payment IDs were not encrypted on the blockchain and would harm your privacy.If the party you're sending to still requires a long payment ID, please notify them.
Mining with your computer helps strengthen the Monero network. The more people mine, the harder it is for the network to be attacked, and every little bit helps. Mining also gives you a small chance to earn some Monero. Your computer will create hashes looking for block solutions. If you find a block, you will get the associated reward. Good luck!
