Twitter questions? 10 points!?

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10 points to the best answer! So I don't know why but whenever someone like puts an icon(smiley face or somthing) in their tweet I can't see it. For example: 🎅🎄🎁🎅🎄🎁🎅🎄🎁🎅🎁🎄 🎅🎄🎁🎅🎄🎁🎅🎄🎁🎅🎁🎄 ONLY-25-SLEEPS-TO-CHRISTMAS 🎅🎄🎁🎅🎄🎁🎅🎄🎁🎅🎄🎁 🎅🎄🎁🎅🎄🎁🎅🎄🎁🎅🎄🎁
AND
Cheering! 🏀📢

It leaves boxes. How do I fix this? I think they are actually like pictures ( pictures of hearts, not <3)

What do I do?

And could someone explain to me twitter? like I don't understand most of it's features. like what does retweet and favorite do etc?
Thanks