I don’t write any theory theory on this website apart from Russian version, but I know other great resources that will help you a ton.
dietdoctor.com – lots of delicious recipes and useful guides.
ketodietapp.com – great place if you have sweet tooth. Full of useful information.
ruled.me – recipes and comprehensive descriptions of everything about keto.
ketogenic-diet-resource.com – many articles about therapeutic applications.
Enjoy!