Is it difficult to learn Photoshop?

I have no experience in Photoshop, but I must design posters / banners / brochures for my company's products and I tried to find free online image editing tools, but according to many comments, Photoshop is the best software I just installed Photoshop on the computer of my company today and I have no idea how to use it. Does anyone know any tutorial for beginners for photoshop? I need to know how to cut people's faces and design them in a poster / brochure. Y…

Is it difficult to learn Photoshop?