This talk has something for anyone whatever level of experience they have
GA4’s defaults are for every business. But you're not every business.
Your traffic attribution is mislabelled, you treat all your website visitors the same and you use the default metrics without thinking about your business.
You can bend GA4 a bit to your needs, but to get properly set-up you're going to want to use the raw GA4 BigQuery export.
You used to have pay a massive premium for this in UA and now they're just giving it away for free. It's the single most powerful part of GA4 that you're not using.