Best gifts that Elliott will like are Crab Cakes, Duck Feather, Golden Pumpkin, Lobster, Pearl, Pomegranate, Prismatic Shard, Rabbit’s Foot, and Tom Kha Soup.
Alex Friendship guide

Alex aspires to be a professional athlete, he spends time working out and at the spa. You can find him southwest from Pierre’s General Store, near ice cream stand in summer, and in the spa in winter.
Best gifts that Alex will like are Complete Breakfast, Golden Pumpkin, Pearl, Prismatic Shard, Rabbit’s Foot, and Salmon Dinner.
Emily Friendship guide
Emily is a blue-haired girl who works at Stardrop saloon. Her passion is to make her own gems, meditation, and clothing. She has a sister Haley. However, you can find her working at the Stardrop saloon after 4 PM.
Best gifts that Emily will like are Amethyst, Aquamarine, Cloth, Emerald, Golden Pumpkin, Jade, Pearl, Prismatic Shard, Rabbit’s Foot, Ruby, Survival Burger, Topaz and Wool.
Haley Friendship guide

Haley, sister of Emily. She enjoys gardening, and photography also has a taste for luxury. You can find her near the Community Center fountain or taking pictures by the river South of Marnie’s Ranch. In summer she can be found near the ice cream stand and museum.
Best Gifts that Haley will like are Coconut, Fruit Salad, Golden Pumpkin, Pearl, Pink Cake, Rabbit’s Foot, and Sunflower.
Harvey Friendship guide

Harvey is a town doctor, spends much of his ti in working. You can find him in the town Clinic and in his apartment, which is also a clinic.
Best gifts that Harvey will like are Coffee, Golden Pumpkin, Pearl, Pickles, Prismatic Shard, Rabbit’s Foot, Super Meal, Truffle Oil, and Wine.
Leah Friendship guide

Leah is an artist, new to the Pelican town. She spends most of her time in sculpting and in taking a walk. You can find her near the Perre’s General store in the afternoon.
Best gifts that Leah will like are Goat Cheese, Golden Pumpkin, Pearl, Poppyseed Muffin, Prismatic Shard, Rabbit’s Foot, Salad, Stir Fry Truffle, Vegetable Medley and Wine.
Maru Friendship guide

Maru is the daughter of the town’s carpenter; she likes machinery and doing experiments. She works at the town clinic. You can find her sitting on the benches, near the saloon, or at the community center.
Best gifts that Maru will like are Battery Pack, Cauliflower, Cheese Cauliflower, Diamond, Gold Bar, Golden Pumpkin, Iridium Bar, Miner’s Treat, Pearl, Pepper Poppers, Prismatic Shard, Rabbit’s Foot, Rhubarb Pie, and Strawberry.
Penny Friendship guide

Penny is a modest girl, daughter of Pam. She spends time tutoring Jas and Vincent at the museum. You can find her in the museum on Tuesday, Wednesday, and Friday, in summer, near the graveyard sitting on the town’s benches.
Best gifts that Penny will like are Diamond, Emerald, Golden Pumpkin, Melon, Pearl Poppy, Poppyseed Muffin, Prismatic Shard, Red Plate, Roots Platter, Sandfish and Tom Kha Soup.
Sam Friendship guide

Sam, who is thinking of starting a band, loves music, and his room is filled with musical instruments. You can find Sam near the 1Willow lane, or near the JojaMart on Mondays and Wednesdays.
Best gifts that Sam will like are Cactus Fruit, Golden Pumpkin, Maple Bar, Pearl, Pizza, Prismatic Shard, Rabbit’s Foot, and Tigerseye.
Sebastian Friendship guide

Sebastian is a loner, spends most of his time alone on the computer, occasionally he plays pool with his friends. He can be found at the night time walking around for a smoke.
Best gifts that Sebastian will like are Frozen Tear, Golden Pumpkin, Obsidian, Pearl, Prismatic Shard, Pumpkin Soup, Rabbit’s Foot, Sashimi, and Void Egg.
Shane Friendship guide
Shane is a Marine’s nephew. He suffers from depression and alcohol dependence. He doesn’t have any friends. You can find him working all day at the JojoMart. After work, he goes to Stardrop saloon.
Best gifts that Shane will like are Beer, Golden Pumpkin, Hot Pepper, Pearl, Pepper Poppers, Pizza, Prismatic Shard, and Rabbit’s Foot.
Conclusion
In the game Stardew Valley, you make friends and also marry them if you want. However, this is only possible if you are giving gifts that they like, and talking, interacting with them on a daily basis.