Please guys if i depend on this app alone without any other external knowledge can i be a good and efficient developer

Question

HTML,JAVASCRIPT AND CSS
https://www.sololearn.com/discuss/2730685/?ref=app

Answer 1

By three methods we may learn wisdom: First, by reflection, which is noblest; Second, by imitation, which is easiest; and third by experience, which is the bitterest.
Confucius
I hope you understand😁🙃

Answer 2

Thank you guys, after learning everything here i'll move to all those additional skills

Answer 3

Short answer: No