Question

what is correct English to say that Transportation from Nyakiriba to Karongi for the trainings on selling avocado seedlings."

Answer 1

You can phrase it as follows:

"Transportation from Nyakiriba to Karongi will be provided for the training on selling avocado seedlings."

Alternatively, if you want to keep it concise, you could say:

"Transportation will be arranged from Nyakiriba to Karongi for the avocado seedling sales training."