And this is why you hire us.
The larger the file size, the longer the download time. The longer the download time, the more impatient and frustrated the viewer becomes. It only take a few seconds and they are outta here!
But if you want to do it yourself, we would be pleased to give you a few guidelines.
You only need the simplest of photo editors.
Crop the picture to only what you need. Empty space is usually a waste of download time.
Resize it to the specs below and save at the highest quality. Then rename it and save at a medium quality. You will have two images, use the medium quality to embed into your website and the high quality if you need to make adjustments and save again at the medium quality.