I'm learning Spanish, Chinese, and French currently! I'm not fluent in any of them, but one day I hope I can be!
Here's how to say hello in each language I'm learning (I know how to say hello in more languages but these are the ones I focus on most!).
Spanish: hola (you've most likely heard this before. It's a very common Spanish greeting)
Chinese: 你好 (in pinyin it's nǐ hǎo, but in this case "ni" is a rising tone and "hao" is like a valley, going down and then up. 你好 literally means "you good.")
French: bonjour/bonsoir/salut (bonjour actually means good day, not hello, but it's used as a greeting at daytime! Bonsoir is kinda like the night equivalent of bonjour. And then salut just means hi!)