sudo apt install zsh-autosuggestions zsh-syntax-highlighting zsh
sh -c "$(curl -fsSL https://raw.githubusercontent.com/ohmyzsh/ohmyzsh/master/tools/install.sh)"
- 
autosuggesions plugin git clone https://github.com/zsh-users/zsh-autosuggestions.git $ZSH_CUSTOM/plugins/zsh-autosuggestions
- 
zsh-syntax-highlighting plugin git clone https://github.com/zsh-users/zsh-syntax-highlighting.git $ZSH_CUSTOM/plugins/zsh-syntax-highlighting
- 
zsh-fast-syntax-highlighting plugin git clone https://github.com/zdharma/fast-syntax-highlighting $ZSH_CUSTOM/plugins/zsh-fast-syntax-highlighting
- 
zsh-autocomplete plugin git clone --depth 1 -- https://github.com/marlonrichert/zsh-autocomplete.git $ZSH_CUSTOM/plugins/zsh-autocomplete
- Open .zshrc
nvim ~/.zshrc
- 
Find the line which says plugins=(git).
- 
Replace that line with 
plugins=(git zsh-autosuggestions zsh-syntax-highlighting zsh-fast-syntax-highlighting zsh-autocomplete)