Breakdown of Þetta er minn heiður, ekki þinn!
þetta
this
vera
to be
ekki
not
minn
my (m, f, n: minn, mín, mitt)
þinn
your (m, f, n: þinn, þín, þitt)
heiðurinn
the credit
Elon.io is an online learning platform
We have an entire course teaching Icelandic grammar and vocabulary.