Gunner_Eat
One piece of my advice would be to think about what you want your reader to be feeling when they read your story.
Example:
Say that I want to describe a heart attack to my reader. I could inform them of this fact or demonstrate it to them.
1. Informing the reader of the heart attack (this is telling)
"He felt his heart racing. There was a pain to his chest. His body dropped to the ground in heap."
2. Demonstrating the fact to the reader (this is showing)
"His heart slowed into an irregular rhythm. Fever overwhelmed his body. His mind became a clutter of garbled thoughts, agitated by erratic spams and feelings of fear. His skin crawled with an unbearable itch, but he was too lethargic to scratch it away."
Hopefully, from example #2, you'd be feeling some kind of concern for the protagonist's health. At least sense that they're experiencing a crappy time. You can check out more on using emotions here: https://thewritepractice.com/emotional-writing
Another way to achieve the show-not-tell thing is describing according to your character's personality traits; what they're doing, thinking and seeing. Their entire world is described according to their personality trait.
Traits can be honed through characters goals and motivations, which aligns to and progresses the plot to the end result. Writing to traits and to a determined plot, typically, you'd only write what is needed to achieve an aim.
Hope that helps.