Fungible means that any token of the same mint is like any other, interchangeable. It also means they are divisible to some fraction, usually 9 decimal points. An example is USDC.
Currently the production ready token on Solana that USDC and most other tokens use is called SPL-token. It has all the standard functionality like transfers, minting, etc.
https://github.com/solana-labs/solana-program-library/tree/master/token
For a direct tool to create a token and add the right configurations and metadata, the Solana Foundation’s Head of Developer Relations, Jacob Creech, has provided this tool:
https://github.com/jacobcreech/Token-Creator
And another guide from Quicknode on how to create an SPL token
https://www.quicknode.com/guides/solana-development/spl-tokens/how-to-create-a-fungible-spl-token-with-the-new-metaplex-token-standard
DexLab has a set of UI-based tools that help with the creation and management of tokens. This allows anyone to mint, add metadata, create OpenBook markets without requiring any programming knowledge.