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If you don't have any investments already, I'd recommend setting up a Vanguard S&S ISA and putting a bit of money in there. Their funds are a diverse mixture, so you don't need to do as much thinking. There's a UK personal finance subreddit which is much better at this than me.
I mean, that's if you want to save for a long time. Shove in a bit of money each month, assuming that it'll grow around 5%. For a novice, it does help you feel out your risk level (In 7 months, I've seen my money down 8% and up 14%).
Once you're a bit better read and you're more accustomed to the nature of investing, then you can jump into trading single shares, if you really must.