Welcome to the forum mate. You should explain what you wanted to learn or should I say something specific then someone will give you a link to the thread like what is given here. Let's say you wanted to learn more about bitcoin wallet then for example I have given you a link about non-custodial wallet which is you will be the one who has full control of it compared to custodial wallet which you don't have the full control (having the seed phrase) and also about open source type of wallet and closed source type of wallet.