Serves as a leader: what he says, people will follow. Hence why it’s ludicrous for him to suggest ingesting disinfectant.
Commander in chief: Leads the strategy in military
Appoint ambassadors and chairs of cabinets and departments
Influences policy making by using veto power.
Can initiate trade.
Etc.
If a bill proceeds past the rules committee then the next step is that the bill is debated with a quorom. I t will be debated in the House of Representatives. If the passes through this step, then it will go through another step which is to get approval from the Senate.