magento2 – Mageto moduel simple

i have an new module at app/code/MyVendor/MyModule and i try to understand structure of module magento2. I have some task of trainning list.I have an controller with execute() method echo sometext to with the new route i define in /etc/routes.xml. Can I have some solution to display these text to the some another page like Home, Category, Checkout and Cart ?.Help me!