One of the things I find really time consuming when starting a project is picking what services to use. There are so many options out there for everything, and the answer to which is best is mostly "it depends...."
I'm really interested to hear if you tend to use the same familiar companies or weigh it up on a case by case basis.
What I have chosen for my new project (a forum similar to a more specialised subreddit)
Image storage: S3
CDN: Cloudfront
Auth: Supabase (it's cheap)
Transactional Email: AWS SES
Marketing Email: Sendgrid (may switch to postmark as I didn't realise they do marketing email now)
Hosting: Render
And probably many others I can't quite think of at the moment!
What are you using? Any particular reason for your choices?