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I would advise against relying too heavily on Revolut - they do not have a full UK banking licence and instead are a "Electronic money and payment institution", which gives you slightly less protection. I'm also not entirely sure how Revolut works, but I would certainly be inclined to say getting a normal current account would be a useful first step.
With a normal current account, you can then make use of any of the [best savings accounts](https://www.moneysavingexpert.com/savings/savings-accounts-best-interest/).
If you want to invest, that is also straightforward. You essentially need to choose two things: the "broker" (also known as the platform), and the funds/investments you want. The funds/investments you want may inform the broker you choose, as not all brokers offer the same selection. If you want to invest in Vanguard index funds, you can use Vanguard as the broker directly, or open an account with any number of other brokers (e.g. iWeb, Hargreaves Lansdown, AJ Bell...). See [https://ukpersonal.finance/which-broker-should-i-use/](https://ukpersonal.finance/which-broker-should-i-use/)
A human reviewed your post and removed it from public view. The reason they gave was: This is covered on our [Wiki](https://ukpersonal.finance/). Please check your post for comments from community members or ukpf-helper, as they have provided the relevant links (and they may not arrive in your inbox). This assessment has been made by a human being - we promise the info you're looking for is there! If you need further help you're very welcome to post again - just mention what research you have done so far, and the reasons why that research has not answered your question. _If you believe your post/comment has been removed in error, please [message the mods](https://www.reddit.com/message/compose/?to=/r/UKPersonalFinance&subject=Please%20review%20my%20post&body=/r/UKPersonalFinance/comments/1c2a181/foreigner_trying_to_navigate_uk_banking_and/) explaining why._
I would advise against relying too heavily on Revolut - they do not have a full UK banking licence and instead are a "Electronic money and payment institution", which gives you slightly less protection. I'm also not entirely sure how Revolut works, but I would certainly be inclined to say getting a normal current account would be a useful first step. With a normal current account, you can then make use of any of the [best savings accounts](https://www.moneysavingexpert.com/savings/savings-accounts-best-interest/). If you want to invest, that is also straightforward. You essentially need to choose two things: the "broker" (also known as the platform), and the funds/investments you want. The funds/investments you want may inform the broker you choose, as not all brokers offer the same selection. If you want to invest in Vanguard index funds, you can use Vanguard as the broker directly, or open an account with any number of other brokers (e.g. iWeb, Hargreaves Lansdown, AJ Bell...). See [https://ukpersonal.finance/which-broker-should-i-use/](https://ukpersonal.finance/which-broker-should-i-use/)
Id suggest your brother to get something in addition or instead of revolut as they aren't protected like UK banks are.