What do Google Robots crawl? earn by blogging adsense income

Apologies if these are newbie questions, I am new to SEO:

• Does which images you use on a website affect Rankings?
• Does content outputted by JavaScript affect Rankings?
• If the answer to the above 2 questions is negative, then why? It's 2018, surely Google could write a bot that can analyse image content and read JavaScript content?

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