Dr. Strange and Portals https://www.youtube.com/watch?v=BSwhX-NDQ8o
https://marvelcinematicuniverse.fandom.com/wiki/Inter-Dimensional_Portal
The portals usually seem to be a connection between 2 points at the same time.
https://thedirect.com/article/marvel-doctor-strange-portal-mistake-mcu-movie
https://screenrant.com/doctor-strange-2-america-chavez-star-portals-power-explained
Where as time+travel is visiting another point on the timeline.
https://paranormal-intersection.blogspot.com/search?q=time+travel
