hello my iphone is full and I want to download my pictures to my computer to give me more space

hey

try this: https://support.apple.com/en-us/HT205703

I recommend to optimize your photos this keeps the full resolution photos to your iCloud and smaller resolution photos on your iPhone when you want to see a photo your iPhone temporarily downloads the full resolution photo from your iCloud

See this Apple support link—>Transfer photos and videos from your iPhone, iPad, or iPod touch - Apple Support

Click on the link in my post right above yours.