Need Some Info and Suggestions

Need Some Info and Suggestions
0
#1

For the responsive front-end projects, what is the best to use and understand? Bootstrap or? Im also finding it difficult to work within Codepen. I think I may just hard-code on sublime and paste it in. Will this work? Any suggestions.
Thank you for your valued opinions.
Vern C.

#2

Have you started learning to use bootstrap?