I'm very new to Magento and I have a functional background. I have read and followed all Magento commerce functional manuals on how to configure the Backend (creating products, customers, adding content, etc ..).
Although the functional manuals are quite easy to understand and to follow, I'm getting errors when trying to upload any image (for the product, category, content, etc ...). see screenshots of error messages encountered below.
I have read on some forums that this could be linked to the permissions of directories & files (770 & 660) or could also be linked to storage capacity (I haven't been able to create/store any product or image so doubting this could be the reason ..)
Could someone explain me what are the possible root causes, how I can check them (from a functional perspective) and how I can fix them (I have very limited technical knowledge but I can, of course, follow a step by step explanation)?
Thank you very much!