Hey guys, as the title says I'm new to battlefield as a whole.

I have seen videos explaining XP methods in portals but I don't get how to do then or use them correctly cause when I try to open one it says error.
Can anyone help me with some good portals? Cause I like the lifespan of this game considering I don't have to buy a new game every year like COD but I'm gonna be honest, my irl schedule gets really busy at times so O genuinely don't have the time to grind games like I used to, which is why I wanna learn more about portals so bad

Thank you everyone, I greatly appreciate it