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1. Create file init.lua in C:\Users\your_name\AppData\Local\nvim\init.lua

2. Add to file init.lua parameters for tabs (for Python I use 4 spaces for identation):
  vim.cmd("set expandtab")
  vim.cmd("set tabstop=4")
  vim.cmd("set softtabstop=4")
  vim.cmd("set shiftwidth=4")
 
3. Add to init.lua configuration for lazy.nvim package manager
https://lazy.folke.io/installation

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set number

set relativenumber

call plug#begin('~/.vim/plugged')

Plug 'morhetz/gruvbox'
Plug 'vim-airline/vim-airline'
Plug 'preservim/nerdtree'
Plug 'ryanoasis/vim-devicons'

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require 'active_model'

class Superhero
  include ActiveModel::Validations
  @@total = []

  attr_reader :name, :age

  def initialize name, age
    @name = name

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class Arsenal
  def self.hello
    'Hello as class method!'
  end

   def mymy
     'Arsen Wenger'
   end

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require 'active_model'

class Superhero
  include ActiveModel::Validations

  attr_accessor :name, :age

  def initialize **args
    @name = args[:name]

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module ActsAsWalker
  attr_reader :distance

  def walk!
    @distance += 1
  end
end

module ActsAsSpeaker
  attr_reader :speak, :gills

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ar = [1, 2, 4]

def square_values array
  array.map! {|e|  e * e }
end

p square_values ar

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def summarize *args
  "#{args[0]} #{args[1]} #{args[2]}"
end


p summarize 1,2,3,4,5

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def hello_message options = {}
  first_name = options.fetch :first_name
  last_name = options.fetch :last_name

  "Hello, #{first_name} #{last_name}"
end

data = {first_name: 'Lero4ka', last_name: 'Melnik' }
# p hello_message data

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require 'active_model'

class Person
  include ActiveModel::Validations

  attr_accessor :name, :age, :size

  def initialize name: nil, age: nil, size: nil
    @name = name
    @age = age