A wallet is your personal access store to your address on the blockchain. There are different blockchains, so there are different wallet solutions. We are currently building on the Solana Blockchain – the official guide to Solana Wallets is here: https://docs.solana.com/de/wallet-guide
We prefer to use the computer with Firefox or Chrome to interact with blockchain content, the best solution for Solana is the Browser Extension https://phantom.app/.
Please download the app from the official source and then follow the steps in the app. You need to write down 12 or 24 words which act as your private key – never share this with anyone. You then set up a password to protect the private key saved on your computer. If you have created a wallet, you can click on the wallet address to copy your public address, which we need for setting up your smart contract etc.