Auto Currency Switcher 2 is a currency switcher extension for Magento 2 which automatically switches store currency based on visitor’s IP address.
Auto Currency Switcher 2 extension tracks visitor’s IP address and automatically changes the store currency to the visitor’s location currency. Visitor can switch to his/her desired currency at any time.

This article shows how you can create event observer in a custom module in Magento 2.
In Magento 2, there is a separate xml file where you can define your event observer. For frontend events, you need to write your code in app/code/YourCompany/YourModule/etc/frontend/events.xml and for admin events, you need to write event observer code in app/code/YourCompany/YourModule/etc/adminhtml/events.xml.
Remember that, you need to place your Observer class in app/code/YourCompany/YourModule/Observer/ directory.

I am getting the following error while adding a new module to my Magento 2 installation and running the command on terminal php bin/magento setup:upgrade.
[InvalidArgumentException] There are no commands defined in the “setup” namespace

This article provides a solution to the error occurred while accessing Payment methods section in Magento admin panel.
Problem: