Nether Portals are very important in speedruns if you have to collects eye of ender fast by trading gold with the zombie piglins. You know it if you are a fan of Dream Speedruns. Also don’t forget to wear Gold Armour while you are in the Nether or else zombie piglins will try to eliminate you. You can also do some Nether Portal builds.
There are different types of Nether Portals like Ruined Nether portal and Underwater Ruined Nether Portal. Ruined Portal in Minecraft can be a great place to find treasures and hidden chests.There are Obsidian in real life but no onw has ever tried to build a real life nether portal before not in my knowledge at least.
There are many ways you can build a Nether Portal like sword nether portal, crying obsidian nether portal(they look cool but they don’t work, unfortunately).