There's a lot of ways to improve your self esteem, you see many of those myTakes and questions on here. I'm going to share how I help my boyfriend with his self-esteem, and add some other ways. I hope these help. Now it is important to make sure your SO knows you love them for who they are, but that you will support them and help them on improving themselves.

My boyfriend has no self-esteem, and neither do I. He knows guys hit on me, and he knows I've had more exes than he has (irl and online), and he feels as if it's so weird I actually like how he looks etc.
My boyfriend is amazing in my eyes, not because of his hot body but because he's an amazing person. He's personally told me that the things I do help a lot in making him feel better.
1. Such as when someone hits on me, I tell them off.
(if they dont stop once I say "I have a boyfriend")

2. I grab his hand every time we walk together.

3. I rub his back when he's tired/not feeling well or upset.

4. I kiss him a lot- lips, cheek, nose or his hand.

5. I make sure he isn't being excluded in the conversations.

He's even told me how when I see him in the mornings he loves the look I get on my face where I smile largely and my eyes light up in excitement.
It's all about the little stuff, along with the compliments I give him:
"I love how you look."
"Oh my god you're so cute."
"Look at you, you little stud."
"Well I feel special when I have the attention of someone who's as amazing as you."

"I love you for who you are. Your looks are just a bonus." And I wink after I say that.
"I wouldn't change a single thing about you."
"I love all of your flaws, they make you, you."
Even random little compliments given throughout the day.
"Your hair looks lovely."
"Aw you're adorable/adorkable."
"You're so cute when you're being nerdy."
"Nice butt." With a playful wink.
Now these are what I do for my boyfriend to help him with his self-esteem. While your self esteem is important, so are theirs. I recommend doing these, because it's the little things in life that matters. He knows I love his looks, but he knows I also love his personality. Just show your SO you love them, words and actions have a lot of impact on someones day and their self-esteem.

A single piece of glitter by itself is nice, but when piled up throughout time, may be the most beautiful thing you could see. 
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2Opinion
This is pretty awesome!! My wife does some of these, and I also do
thank you and awww <3
I giggled at the image under #1. Great take by the way :)
I just don't care what other people think;-P
Well are you your SO?
True, only the girl I'm with matter, but an SO wouldn't/shouldn't have anything negative to say about you?
this was so you can help improve their self esteem