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The official online home of PrestaShop is at: http://www.prestashop.com/
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PrestaShop has a strong and enthusiastic community of users, and they all gather on the community forums in order to exchange tips, tricks, best practices, and ask/answer questions. Diving into the forums is a great way to feel the power of the PrestaShop community.
The community forums can be accessed at: http://www.prestashop.com/
Paid support
PrestaShop provides paid support, ranging from one-time questions tickets to complete yearly support.
Reading discussion threads is open to all, and you will need to register in order to ask questions or gives answers.
Be mindful of the language you post: there are a variety of forums/communities for many languages.
Addons
Sometimes, finding help simply means find the right module for a given purpose, or the right theme for your shop. This is why we have set up the Addons website, where PrestaShop users can find hundreds of modules and themes, and buy them for a reasonable price – or even for free sometimes.
The PrestaShop Addons website can be found at: http://addons.prestashop.com/
Training
http://www.prestashop.com/en/training/