Photo issues (perhaps HTML?)

Hello,

I am new to WordPress and using it to maintain a client’s blog. I am having issues with adding photos; I uploaded one to library (tried jpg, png, etc.) and have tried to insert it into the post via “Add an image”, via “Add media”, as well as paste the media library file’s URL.

I finally got the image to appear in the post itself, but it seems there is a second piece of HTML code that needs to be included for the image to be visible, which causes the main blog page to repeat the image (one is a stretched size). I can’t figure out for the life of me why the image won’t show up when I do one piece of image code, and then can’t control the sizing of the gigantic stretched image on the blog homepage.

This is what I’ve included in the post:

<center><img src=”https://wolfers.com/blog/wp-content/uploads/2012/12/Screen-Shot-2012-12-21-at-5-42-51-PM-200×260.jpg&#8221; alt=”” title=”Entertaining ” width=”200″ height=”260″ class=”aligncenter size-medium wp-image-164″ /></center><center><img src=”https://wolfers.com/blog/wp-content/uploads/2012/12/Screen-Shot-2012-12-21-at-5-42-51-PM-e1356639846856.jpg&#8221; alt=”Wolfers” /></center>

And here is the blog link: https://wolfers.com/blog/. That gigantic image is being stretched even though the original file size is quite modest. The image source on the huge photo reads Dimensions: 200px × 249px (scaled to 678px × 844px)

Any insight into this is much appreciated! I need to learn HTML more.