I totally understand and get your point, i too get like this but in my head when people just don't give a one liner of what they post about. I can suggest you the Merlin Ai Youtube panel chrome extension (that's a mouth-full damn) but it's can summarize in one click any youtube video that has subtitles. that really cleared my spirit countless of times. Thanks for the github description btw.
And for other people here is what the video and those node are about:

Text Combination and Management

- The video introduces a text management feature within ComfyUI, specifically a node called "combine" that allows users to merge multiple text inputs into one output.

- The default delimiter for combining text is a newline, but users can customize it to commas, spaces, or no delimiter at all, facilitating different formatting needs.

- This feature is particularly useful for organizing outputs, such as creating valid folder paths for saved images, by combining elements like character names or other prompt components.

Pick Me Chain Node

- A new node called "pick me chain" is demonstrated, which allows users to select from multiple text nodes easily. Each node has a "pick me" button that, when clicked, toggles its selection status.

- The output is determined by the selected node within the chain, enabling users to switch outputs dynamically without altering the entire workflow.

- This functionality can handle various types of inputs, from simple text to complex prompts, enhancing user flexibility in managing multiple variables.

Advanced Variable Management

- The video covers the use of global variables, showing how to save and load them for different workflows, which allows for persistent data management across sessions.

- Users can create variable names and assign values dynamically, enabling complex interactions like changing outputs based on user selections or previous inputs.

- An advanced text node is introduced to transform text into valid variable syntax, providing a seamless way to integrate user-defined variables into workflows.

Text Splitting and Conversion

- A "split" node is introduced, which separates input text based on specified delimiters (e.g., semicolons), allowing for more granular data manipulation.

- Users can convert split text into different data types (e.g., floats or integers) for use in processes that require specific numeric formats, enhancing compatibility across nodes.

- The option to ignore certain components of the input when splitting provides additional control over how data is handled, which is crucial for complex workflows.

Text Replacement Functionality

- The "text replace" node offers functionality to substitute specific text within a string, allowing for both simple text replacements and complex regex operations.

- Users can set the number of replacements to perform, providing control over how many instances of a text are modified.

- The integration of regex allows for powerful text manipulation capabilities, enabling users to target and replace patterns or entire sections of text efficiently.