Drupal 8.x

Hi,

We were trying to resize images to multiple sizes like 100px x 100px, 400pxx400px and  800pxx800px etc..

So what we done is, done the responsive settings like in the attached screenshot.

Then we have added the same with form filed display, that also mentioned in the screenshot.

After saving the image against that field,  i gone through the server images path. But seems to be all the resized images are not saved , but thumbnail and 700px only.

Is there anything need to do get all the resizing ?

I need to hide authoring information from moderator. I have created moderator role and i would like to hide such info from this kind of users, how can i do this? 

I have one task to do but i'm not sure where to start. I have to create a content for storing current and historical data for each term in "extaxvoc", the current data will be shown on Search pages for "extaxvoc". I have no idea where to start with it as the task seems strange to me but at the same time i'm completely new to drupal cms overall.

I added an event subscriber for add to cart event. There I defined a function to react on add to cart event. Everything works fine as my eventsubscriber is being called. I want to update the unit price of product which is being added to cart. Below is the code I used but it is not working. Price of the product is not updating to the price I am setting.