What's the difference between Base Coin, Base Currency and Quote currency

Base Currency

Currency unit prices are quoted as currency pairs. The base currency, also called the transaction currency, is the first currency appearing in a currency pair quotation, for example, ETH is the base currency in ETH/BTC

Quote Currency

A quote currency is the second currency quoted in a currency pair, for example, BTC is the quote currency in ETH/BTC

Base Coin

Base Coin is only used in certain bot type for the bot to focus on increasing the given currency which is the Base Coin, and do not care about any specific currency pairs. e.g. If you set BTC as the base coin in a Scanner Bot, the bot can trade any pair as long as it involves BTC, hence to have better chance to seize the opportunity