Peercoin is an older blockchain project, first conceived in 2012. It was actually the first cryptocurrency to operate under the Proof of Stake protocol, and users are rewarded with a 1% annual reward for staking their coins.
Their goal was to create a secure coin, with low fees that could operate without the massive amounts of energy required for Proof of Work projects and would give anyone the ability to mint their own coins, even if they did not have a computer capable of mining the traditional way.
Likely the most promising aspect of this asset is that it has been around for a very long time, and it's not likely that it will be going anywhere. Due to being the first on the scene for this exciting new algorithm, PPC has developed a dedicated fan base over the years. The code base is still being actively developed, and if you plan to make a Peercoin investment, you are banking on this continued community engagement and the low coin supply.
The number of exchanges which offer traders the ability to buy Peercoin is quite large. There are several heavy volume exchanges here, as well as some more niche options if you'd prefer to use them. Bitcoin is the highest volume trading pair here, as per usual, but there are some secondary options which would also be viable such as a US Dollar pairing, a Euro pairing, and a pairing for the US Dollar Tether. Any of these have plenty of volume to execute a trade.
In order to store your coins, you'll need to download the official wallet from the coin's website. They have desktop client wallets available for Windows, Linux and Mac operating systems. Simply download the wallet that matches your computer's operating system, encrypt your wallet with a safe password, and then create a backup of your wallet file on an external drive for safe keeping.