Parallel Current means, consider if you two batteries in your home.
Now the question is how you will connect these two batteries parallel.
Connect Plus(+) (Always Red sign) of one battery and another (+) sign of another batteries.
And
Connect Minus( -) (Always black sign) of battery and another Minus(-) sign of another batteries.
Like the below diagram.
Parallel Connections

Serial Connections
Connect Minus(-) (Always black sign) of one battery and another Plus (+) (Always Red sign) sign of another batteries.
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Great blog, thank you for sharing information
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