I will try to summarize the book through excerpts from the same:
Thread 1: Why Dividend Growth Investing

-The trick is simple: find a business with reliable growth that will share that growth with its owners, be patient and watch it grow. https://twitter.com/dmuthuk/status/1300084850745987078

-Fast growth is not the goal, for fast growth is not reliable growth and isnʼt worthy of your patience.

-Dividend growth is the critical piece in the puzzle for creating a portfolio that will serve you over the years.

-The reason it is so important is that dividend growth drives the compounding principle for individual stocks in a way that is certain and inevitable.

-In effect, you get a “double dip” when you invest in high-yield stocks that have rising dividends.

-You get the income that increases to meet or surpass inflation, and you get the effect of that rising income on the stock price, which is to force the stock price higher.

-the value of the increased income of your stock must push up the price of the stock that produces the income. For stocks compete not only with each other for investorsʼ dollars, they also compete with interest rate instruments.

-it is the logical and inevitable result of investing in a company that is actually doing well enough, in the real world, to both pay dividends and to increase them on a regular basis.

-- Weʼve seen that compounding in stocks has an amazing effect when given some time to work. But compounding with reinvested dividends has an astronomical effect over time.

-The dividend gets reinvested in more shares, which themselves are increased by total return, and which themselves yield dividends to be invested in yet more shares. The reinvestment plan works so well because you are continually buying more shares,...

...and those shares themselves reap both income and capital gains.
-time and patience are the keys, but the rewards are there if youʼve got the discipline.

Single Best Investment approach is probably the most conservative and risk-averse strategy that you can possibly use to invest in the long-term growth of the economy and the corporate stocks within that economy.

End of Thread 1