Attached Link: Original Bench Picture

I am new at this and just started uploading to RR. In your answer try to dumb down the tech speak, you old camera guys and gals talk like rocket scientist...FOV...POV...Fstop here..aperture there...you get the drift....LOL :) ..... Go easy on me, if you can.   I have questions, I got a lot of comments on a picture I uploaded, "A Cool Bench to Sit On", was out of focus, and when I went back and looked at it online it is definitly blurry. Then I thought about it and did not remember it that way in the original, before I cropped and resized it. So I went and looked, the original is clear and crisp. The software I use to crop and resize came with my laptop. (HP Photosmart Premier) The original picture size is 2592x3872 @4.64mb and I had to resize it to 670x899@479kb. I have to keep resizing until I get to 512kb or under to upload. Here are my questions, when you resize a picture do you lose clarity?  Is there a better way to resize and crop  and not lose clarity. What do you think? **I appriciate you taking time to answer, and want to thank you in advance.** I also want to thank Richardphotos and  auntietk  who have already given me advice to try on this subject.

Todd