Don't let your website be ruined by easily correctable mistakes.
Those new to building websites make some simple mistakes that are easily corrected and will improve their site all round. Almost the primary one is "Don't Steal off the Internet" - don't copy graphics or images from other peoples' websites. Some of them will be owned by commercial image collections like Shutterstock and they will come after you for using their copyrighted material (I've seen the emails they send). Many websites will be happy for you to use some graphics they have created about their business - if you ask. There a loads of free images and graphics out there and even if the image you really want is on a paid for site they are usually only a few dollars to buy.