AWS
AWS cloud fundemental
AWS Cloud Practitioner Essentials is an amazing free training by Amazon that explains the various Amazon web services using a coffee shop analogy - truly amazing. I recommend having AWS overview whitepaper while going through the training.
AWS Certified Cloud Practitioner Training Notes, Neal Davis.
AWS Self-Paced Labs is a great way to get some hands-on experience. Here are some examples:
AWS Machine Learning Specialty
AWS SageMaker documentation (solutions for some problems encountered in the past)