Thanks to the internet, learning anything new has become cheaper. You don’t have to invest a penny to learn forex. Start with Babypips.com. There is a free course for your reference. You can also watch youtube videos by professional forex traders, such as Rauner Teo, AlphaTrader, Karen Foo, etc. Ensure that you practise what you learn on a demo account as trading is a practical skill and you need a lot of practice.