On the web, you can use either jpg or gif types of images. The image is always put onto the left side of the screen, at the next possible line - just like the next piece of text would be. But don't be surprised if it is a little lower than the text - an image is larger than a letter. Try it out and see.
One thing you need to be able to do is to tell the browser, through the HTML, where the image is sitting - known as its path. Put simply that means which folder it is in. So make sure you know!!
One suggestion I would make is - KEEP IT SIMPLE, STUPID!
That way you don't confuse yourself. What I do (because I am simple, stupid)is to always put my images into a subfolder called "images". In that way, I always know where the images related to eg. a particular website are. They are within the same folder as the HTML files, within the subfolder called "images". Doesn't matter if you do it this way or find your own - just do create a system and stick to it. You'll be grateful in a few months time - once you've forgotten how you did it.
You also can change the size of an image within the <img src>
Add within width=100 or height=200. You are actually supposed to use both, but to make that work for you, you need to know the total dimensions of the image. I don't normally, so I just use one or the other. So,
<img src="imagename.jpg" width=200>
This makes the width of the picture 200 pixels. The height will be scaled down proportionally. Try different numbers as widths and heights to see how it works.
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