In last weeks, there are many shops running on Prestashop receiving spam in Russian language. Prestashop has improved security of contact form in 184.108.40.206 version with this fix, but that helped only temporarily.
As cryptocurrencies are more and more popular, you may want to allow your customers to pay with Bitcoin, Litecoin, Dash or other crypto. Here are two examples of payment gateway services, that will allow you to easily implement cryptocurrencies in your store with their free Prestashop module.
With default settings, Prestashop supports only JPEG format, so if you upload your logo in PNG format, it's converted back to JPEG. You have to first setup image preferences to support PNG. Go to Preferences > Images and setup as follows:
This article describes how to migrate Prestashop installation from your PC (localhost) to your domain. The reverce process is pretty much the same. On localhost I'm using XAMPP, which works well for Prestashop without setting any special parameters.