What do man-y deceivers and seducers (false Christs and false prophets) say and do in the Olivet Discourse?

The best way to recognize deceivers and seducers (or false Christs and false prophets) is for you to come to know the true Christ. A bank teller can easily spot a counterfeit bill because they are thoroughly familiar with the real thing. Same thing with Christians. When you know, serve and follow the true Christ, you can spot a counterfeit quite easily.