Ethereum Wallet are applications that let you interact with your Ethereum account. Think of it like an internet banking app – without the bank. Your wallet lets you read your balance, send transactions and connect to applications.
Your wallet is only a tool for managing your Ethereum account. That means you can swap wallet providers at any time. Many wallets also let you manage several Ethereum accounts from one application.
That's because wallets don't have custody of your funds, you do. They're just a tool for managing what's really yours.
Ethereum isn't just for digital money. Anything you can own can be represented, traded and put to use as non-fungible tokens (NFTs). You can tokenise your art and get royalties automatically every time it's re-sold. Or use a token for something you own to take out a loan. The possibilities are growing all the time.
Ethereum and its apps are transparent and open source. You can fork code and re-use functionality others have already built. If you don't want to learn a new language you can just interact with open-sourced code using JavaScript and other existing languages.