you can adjust your image size by putting width="numberhere" height ="numberhere" in your image tag ! for example < img src="url" width="number here" height="numberhere" >

I'm a bit slow and don't really know what this means but I'd suggest finding a flexbox layout on neocities and picking about the code! that way you can start to understand css and how layouts work, at least that's how I learnt coding

not who u asked but what helps me is i always draw out what i want my page to look like/ any features it has and then make the skeleton/ structure from there using flexboxes ^_^