Initialization (`init.lua`)

Create init.lua:
```
touch ~/.config/nvim/init.lua
```
This command creates a new file named init.lua in your Neovim configuration directory, which will store your custom settings.
Basic Settings in init.lua:
```
vim.o.number = true  -- Enable line numbers
vim.cmd('syntax enable')  -- Enable syntax highlighting
```
These lines set basic Neovim options: enabling line numbers and syntax highlighting, which are essential for better readability and coding efficiency.

Modular Setup

Create Modules:
- Make Lua files like keymaps.lua, plugins.lua in ~/.config/nvim/lua/. This modular approach allows you to organize your configuration efficiently. For example, keymaps.lua can hold all your keybindings, while plugins.lua can manage your plugin configurations.
Include Modules in init.lua:
```
require('keymaps')
require('plugins')
```
These lines in your init.lua file load the modules you created. It keeps your main configuration file clean and your settings organized.

Install Packer:
```
git clone --depth 1 https://github.com/wbthomason/packer.nvim\
  ~/.local/share/nvim/site/pack/packer/start/packer.nvim
```
Packer is a plugin manager for Neovim. This command installs Packer, allowing you to easily add, update, and manage your Neovim plugins.
Define Plugins in plugins.lua:
```
use {'neovim/nvim-lspconfig', config = function() require('lsp') end}
```
Here, you're telling Packer to use the nvim-lspconfig plugin. This plugin is used for configuring LSP (Language Server Protocol), which provides features like auto-completion, code navigation, and syntax checking.

Global Mappings Example:
```
vim.api.nvim_set_keymap('n', '<Leader>f', ':Telescope find_files<CR>', {noremap = true})
```
This code maps <Leader>f to Telescope find_files in normal mode, enabling you to quickly search for files.
Mode-Specific Mappings Example:
```
vim.api.nvim_set_keymap('i', 'jj', '<Esc>', {noremap = true})
```
This snippet maps jj to <Esc> in insert mode, providing a quick way to exit insert mode.

Configure LSP Client:
```
require'lspconfig'.pyright.setup{}
```
This line sets up an LSP client for Python using pyright. LSPs are crucial for advanced coding assistance like error detection and code suggestions.
Setup Autocomplete:
- Use a plugin like nvim-compe for autocomplete. This plugin offers intelligent code completion, which is a huge productivity boost.

Create/Edit .tmux.conf:
```
touch ~/.tmux.conf
```
This creates or edits your Tmux configuration file, where you can customize Tmux to your liking.
Set Global Options in .tmux.conf:
```
set-option -g prefix C-a
set -g status-right 'Battery: #{battery_percentage}'
```
These commands change the default prefix key to Ctrl-a and add a battery status indicator to the right side of the status line.

Write Lua Scripts to generate dynamic Tmux commands.
Run Scripts to update your .tmux.conf. For example, a Lua script can be written to adjust the status line based on time of day or system status.

Add Key Bindings in .tmux.conf for efficient navigation. For instance, binding keys for splitting panes or switching between them can significantly speed up your workflow.
Script Session Setups: Create scripts for predefined layouts and windows, enabling you to launch complex Tmux environments with a single command.

Use Lua Scripts for dynamic status line updates in Tmux, like changing colors or displaying contextual information.

Regularly Review your configurations for performance impacts. This includes monitoring load times and responsiveness.
Test Config ChatGPT urations in a separate tmux session to ensure your changes work as expected without disrupting your current workflow.

Include a Section: Adding a troubleshooting section or an FAQ can help users resolve common issues they might encounter while configuring Neovim or Tmux.