how can I check which one of my mangas have updated

I only know mobile layout. A few ways.
1. Top of page, top right, press bell icon and check notifs.
2. Press 3 lines next to bell and press "homepage" to see what you have added. Click on comic and scroll down to what was uploaded and when.
3. Or you can press the clock looking icon with the arrow to the left of the bell. It will tell you if there are updates since you last saw a manga, even if you don't have it saved

mark them as "now reading" or "already read" and it should automatically give u notifs everytime there's an update ^^!!