Where can I find good crocheting patterns?
The best resource for all crochet and knitting needs by far is Ravelry. Ravelry requires you to create an account and provides an astounding library of patterns, yarns (so it's easy to find a substitute), a community platform and your own project notebook. Some paterns are paid-for, but many are available free. As of me writing this reply there are over 1600 crochet rug patterns listed on Ravelry, some 600 of which are free

Youtube is full of crochet tutorials if you look around a little. For example Elena Rugal has a great library of crochet technique videos

If you want to dig into public domain resources, Antique Pattern Library has a section with hundreds of old magazines with patterns, though they may be hard to read for a modern, inexperienced crocheter because of the differences in writing style and extensive use of abbreviations

Yarn brands publish their own patterns, for crochet I particularly recommend Scheepjes. Similarly, many magazines exist and can be bought both online and in paper, check out titles such as 'Inside Crochet', 'Molly Makes' or 'Love Crochet'. Note that most of these will be included in Ravelry's library

Finally, there are countless crafty blogs, e.g. Moogly's, with tutorials and patterns