SushiSwap and Uniswap are both decentralised exchanges (DEXs) that allow users to buy and sell a variety of cryptocurrencies. They are both based on the Ethereum blockchain and use smart contracts to facilitate transactions between users. However, there are some key differences between the two:

1. Governance: SushiSwap has a more decentralised governance model than Uniswap. Uniswap is controlled by a single entity but SushiSwap is governed by a decentralised autonomous organisation (DAO) that allows token holders to vote on important decisions related to the platform.

2. Tokenomics: SushiSwap and Uniswap have different tokenomics, or the economic principles that govern the distribution and use of their respective tokens.

3. Fees: SushiSwap and Uniswap have different fee structures. Uniswap charges a fixed fee of 0.3% on all trades, while SushiSwap uses a dynamic fee structure that adjusts based on the supply and demand of SUSHI.

4. Features: SushiSwap and Uniswap have different features and capabilities. SushiSwap has a staking feature that allows users to earn rewards by providing liquidity to the exchange, while Uniswap has a more user-friendly interface and a wider range of supported cryptocurrencies.

Uniswap is a DEX that allows users to buy and sell a variety of cryptocurrencies. Its native token is called UNI and here’s how you can buy it:

1. Choose a cryptocurrency platform that supports UNI. Some popular ones that offer UNI include Uniswap itself, and the Crypto.com App and Exchange.

2. Sign up for an account on the platform and complete the verification process.

3. Set up a wallet for UNI. Most exchanges will provide a wallet for you to store your UNI, but you may also want to consider setting up a separate wallet using a hardware device or software program.

4. Deposit funds into your account.

5. Place an order to buy UNI. Go to the platform's trading page and select UNI as the currency you want to buy. Enter the amount of UNI you want to purchase and place your order.

On Uniswap, you can buy and sell a variety of cryptocurrencies. Here’s how to start using it:

1. Set up a cryptocurrency wallet: In order to use Uniswap, you will need a cryptocurrency wallet to store your digital assets in. There are many options available, including software wallets that you can install on your computer and online wallets that you can access from any device with an internet connection.

2. Connect your wallet to Uniswap: Uniswap is a decentralised exchange, which means that it does not hold your funds. Instead, you will need to connect your wallet to Uniswap in order to access your funds and make trades.

3. Choose the cryptocurrency you want to buy or sell: Once your wallet is connected to Uniswap, you can browse the available trading pairs and select the one that you want to trade.

4. Add liquidity or place an order: Depending on whether you want to buy or sell a cryptocurrency, you will either need to add liquidity to the Uniswap exchange or place an order. To add liquidity, you will need to provide a certain amount of a cryptocurrency and its corresponding token to the Uniswap pool. This will allow you to earn a share of the trading fees on the exchange as well.

5. Confirm the transaction: Once you have added liquidity or placed an order, you will need to confirm the transaction by signing it with your wallet.

Here's how Uniswap works:

1. Users deposit tokens into a liquidity pool, which acts as a virtual exchange where buyers and sellers can trade. When a user deposits tokens into the liquidity pool, they receive a proportional share of the pool in the form of liquidity tokens.

2. When a user wants to buy a token, they send a request to the smart contract with the desired amount of ETH and the token they want to purchase. The smart contract then calculates the amount of the token the user should receive.

3. The smart contract then checks the liquidity pool to see if there are enough tokens available. If there are, it will transfer the requested amount of tokens to the user and the appropriate amount of ETH to the liquidity pool. If there are not enough tokens available, the trade will not be executed.

4. When a user wants to sell a token, they can do so by sending the tokens to the smart contract along with a request to sell them for ETH. The smart contract will calculate the appropriate amount of ETH the user should receive. The smart contract will then transfer the requested amount of ETH to the user and the appropriate amount of tokens to the liquidity pool.

There’s a wide range of cryptocurrency wallets that you can securely store your UNI in. These include software wallets like the Crypto.com DeFi Wallet and hardware wallets that resemble USB flash drives.