To make a Nether portal in Minecraft without a diamond pickaxe, you can follow these steps:

Prepare an area where you can have a 5 tall and 4 wide rectangle
Carefully pour water onto a lava piece to make an obsidian block
Carry on making obsidian until you have the 5 by 4 rectangle
Light the inside on fire with flint and steel which activates the nether portal
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