A cryptocurrency wallet is a device, physical medium, program or a service which stores the public and/or private keys for cryptocurrency transactions. In addition to this basic function of storing the keys, a cryptocurrency wallet more often also offers the functionality of encrypting and/or signing information.
In order to purchase $LDFI tokens, a wallet connected to the Binance Smart Chain (BSC) is necessary as is importing the $LDFI token before a purchase of $LDFI can be completed. Please see the articles on connecting a wallet and importing $LDFI to the wallet for more information. Once those two steps are complete, please see "where can I buy $LDFI?" to purchase $LDFI tokens.