In order to mine a particular cryptocurrency, you will need a hardware device suited to mine that cryptocurrency's mining algorithm. Depending on the coin, you will either need an ASIC miner (computer exclusively designed for mining specific coins) or a PC with a powerful GPU (graphics card) or CPU (processor) in some cases.
Each coin requires different hardware (depending on the algorithm used) that may or may not be used to mine other cryptocurrencies! You must always ensure that your mining equipment is suitable to mine your chosen cryptocurrency. Mining cryptocurrencies with unsuitable hardware will either be extremely unprofitable or it won’t work at all.