In sl web I cannot see many a things about my profile e.g. my followers and challenges. Challenge section not available and new-code only opens a html project. Private message also not available.
What lot am I missing?
I feel your pain being a web user. Your missing information only available on app for Sololearn. You do other than web codes on Sololearn web. Get where it says "HTML/CSS/JS" and you'll get the list.
Though I am considering going to Sololearn app because of features you're talking about that we don't have on web.