One of the best editors for wordpress
Adding images can be a problem if you are not familiar with the terminology.
adding an original image can make your site a lot slower for your visitors it is best to resize your images prior to uploading them. an ideal size is 1200px to 1500px on the longest edge portrait or landscape with a dots pr inch (dpi) of 90, and a image compression of around 80%.
The problem is if you do not resize your images the poor person on a poor mobile phone may have to wait a real long time to view your images.