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Solana has multiple onchain programs you can use. Instructions that use these programs need to have data in a custom format determined by the program.

Using custom onchain programs

• Non-Fungible Tokens (NFTs) are represented on Solana as SPL Tokens with an associated metadata account, 0 decimals, and a maximum supply of 1
• Metaplex offers a collection of tools that simplify the creation and distribution of NFTs on the Solana blockchain
• The Token Metadata program standardizes the process of attaching metadata to SPL Tokens
• The Metaplex SDK is a tool that offers user-friendly APIs to assist developers in utilizing the onchain tools provided by Metaplex
• The Candy Machine program is an NFT distribution tool used to create and mint NFTs from a collection
• Sugar CLI is a tool that simplifies the process of uploading media/metadata files and creating a Candy Machine for a collection

Create Solana NFTs With Metaplex

• You may recall SOL is the 'native token' of Solana. All other tokens, fungible and non-fungible tokens (NFTs), are called SPL Tokens
• The Token Program contains instructions for creating and interacting with SPL Tokens
• Token Mints are accounts that define a specific token. This includes information about the token itself (like how many decimals it has), the account allowed to mint more tokens (called the mint authority), and where to find more information about the token like a description, image, etc. The mint authority can use the token mint to make more tokens!
• Token Accounts hold tokens of a specific Token Mint. For most users, their balances of each token mint are stored in Associated Token Accounts - accounts with addresses made from their wallet address and the token's mint.
• Creating Token Mints and Token Accounts requires allocating rent in SOL. The rent for a Token Account can be refunded when the account is closed, however, Token Mints currently cannot be closed.

Create Tokens With The Token Program

All modifications to onchain data happen through transactions. Transactions are mostly a set of instructions that invoke Solana programs. Transactions are atomic, meaning they either succeed - if all the instructions have been executed properly - or fail as if the transaction hasn't been run at all