Speeding up WordPress

I’ve just totally redone my site
http://www.ridesonthewildside.com

I am using a child theme

I used gtmetrix and have the following issues

1. The following image(s) are missing width and/or height attributes.
2. The following resources are missing a cache validator. Resources that do not specify a cache validator cannot be refreshed efficiently. Specify a Last-Modified or ETag header to enable cache validation for the following resources:
3. There are 27 static components without a far-future expiration date.
4. There are 27 static components that are not on CDN.

I have tried to google fixes for all above and cant find anything that works.

Any help will be appreciated