re: Tour De France 2019: Egan Bernal Wins the TDF

Depends on the race you are watching.

The easiest to watch and understand are mountain stages and essentially you are looking to see who is breathing the hardest and who cannot keep up with attacks.

Sprint stages are more about seeing who has position and who gets boxed in as position is king.

Best thing to do to learn is that in any race teams have the same 1-2 digits e.g. team xyz has numbers 31-38. Numbers ending in 1 mean team leader/featured rider.

Also looking for special jerseys like the national road race champions for each country. (If you win the National road race you get to wear a team special jersey that is in the style of the national championship jersey) If you win the world road race you get to wear the world championship version of your teams jersey. If you are a former World Champion you wear special sleeves on your team jersey with world colors around the circumference of bottom of the sleeves.

Same goes for time trial jerseys in time trials.