llms excel at questions asked in natural human language. For example, it's better than a search engine when you're trying to remember an old show or game that you can describe but can't remember the name. It's quite good for subjective tasks. For example, it can spit out templates, such as professional documents and emails, quite well. It's very good for bouncing ideas off of it. For example, you can list a problem, mention the various ways you've tried to solve it, and then ask for further ideas on how to fix it.
It's also good for learning a language. Some might object and say the grammar skills aren't perfect (this is true), but conversing with the LLM in the language you're learning and receiving responses back in that language is extremely helpful at progressing (especially when you're at that awkward level where native speakers don't want to speak with you!). You can prompt it to formulate quizzes or ask it to provide you sentences at the level you're learning (A1, B2, etc.).
Many naturally get upset and say you shouldn't be relying on AI, and to that I agree. The sad reality though is today's ChatGPT writes better than the average person online. That's an indictment on the culture. I would never use ChatGPT as an authority figure. It's just a tool. How well you formulate the prompts will determine how much you can extract from it.