Group training or 1-2-1?
If you are starting out in photography or post processing, group training is a great way to learn. It usually very sociable and interactive, you will almost certainly meet lovely people with a common interest. Group training also exposes you to a wide range of images and techniques you might not have seen or thought of doing. I highly recommend group training in your early stages.
Once you have got to grips with the basics and you are feeling more confident, that's when 1-2-1 can accelerate your learning. At this point you will get less from group training as you will already have a good understanding. Exploring 1-2-1 will allow you to focus on the areas you need and at a much greater depth than a group session is able to reach.