HTML Course in English

Hello lovely people, can anyone please recommend a good course for HTML, currently I am able to edit HTML but I cannot go deeper that this, So I am not sure that a really basic course will be suited for me. It would be great in the course looks into web-design more specifically for e-commerce sites.

It is also really important that the class is in English and is given by an accredited association as my employer needs to foot the bill.

Thank you for any help or leads.
Pixie