In panchang show on your website, What do the symbols (hand, skull etc) stand for?
Those icons are pretty self-explaining and mean a group nakshatra belongs to.
Place a cursor on nakshatra [Number][Name][Time] and read a hint popped-up.

For example, a knife means sharp nakshatra, a hand - friendly.

The same with colors, it's a type of nakshatra.

Also, what does red color font signify under Yoga on this table?
Those are unfavorable yogas.