bootstrap

• the-best-way-to-learn-Bootstrap
• sass mixin 
• galaxy-j7-prime responsive check
• baseline
• reboot
• less
• sass
• flexbox
• bootstrap plugin?
• modal and modal.js?
• bootstrap 3 vs bootstrap 4
• when do we need id attribute? is it always required?
• How to define our own class in bootstrap?
• How can we customize appearance?
•  sm means small
• lg means large
• how to view properties in browser?
• how to analyze properties in browser?
• order pf the property values?
•