cloudfront invalidation

OK I got it , I have more questions about this so that I understand the matter:

1. Do I need to create a new invalidation every time I update my files in s3 - because I want my users to directly receive the content I uploaded and that the display does not freeze.
2. Do you charge me a fee for creating an invalidation or for each activation of it? (every time a user requests the file)?
3. Is the service you are currently giving me free and included in our account? Thank you!

Hi,

1. The content is cached in CloudFront until your configured time-to-live expires. If you want to see changes reflected immediately, you could either set the ttl to 0, create an invalidation or exclude certain files/paths from caching.
2. The invalidations are charged per file path. So, if you are charged the same if you specify /index.html as file path or /*.png for example. Basically, how many different paths do you specify
3. Virtually all AWS Services are billed on a pay-as-you-go basis, meaning you are charged for usage of the service. In case of CloudFront, the major billing dimensions are data transfer and request count. You can see more details here: https://aws.amazon.com/cloudfront/pricing/