Is dollar cost averaging one of the strategies that beginners should think about?

As a beginner myself, I utilise the technique of DCA for most of my investments. It is definitely a strategy you should consider, especially if lump-sum investing makes you hesitate or falter when entering the market.

Does it really work? I think the question is what is your idea of "working"? Does it protect you against market volatility? I would say so. Especially if you're investing in volatile securities like equities, where the price can really fluctuate from month to month.

If your question about "does it work" refers to the returns, I think it depends on the market situation when you invest, and also how long you hold your investment for.

You could buy an asset at rock bottom with a lump-sum, and it rises sharply early on. You could buy an asset at a 10-year high with a lump-sum, then the market corrects in the next month. These two examples highlight either extremes of lump-sum investing. But if you DCA and split your investment into smaller sizes over a few months, you then "ride out" that volatility. Sure, you may have bought at a very high or low price in one particular month. But you're not too bothered because it was just a small part of your overall investment.

At the end of the day, you need to know what your own risk profile / personality is. As beginners, some people are unfazed even if they see their portfolio drop 50% in a month. Conversely, some seasoned investors will tolerate no more than single digit losses in a given year. There is no right/wrong to this. Choosing DCA or other investment methods (lump-sum, intermediate) is just a reflection of your personality as an investor.

Have fun!

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Edited

I'm gonna add that if your full net worth (less emergency funds, short-term savings etc) is already deployed in investment, you kinda have no choice but to invest via DCA.

Imagine from January 2021, I set aside $1k monthly to invest. If I wait till December 2021 to accumulate that $12k lump sum so invest at once, I will have missed out on Jan - Nov (11 months) of market exposure. As compared to if I had put in $1k monthly into my portfolio from Jan.

Don't lose the forest for the trees. It's not ultimately about DCA vs lump-sum, but about getting into the markets and harnessing returns.​​​

The best strategy is a strategy that suits you. What this means is that you are self-accounted, and do not have a sleepless night worrying about your investment portfolio.

DCA is a technique that most investors used. Newbie or experts.
The goal of DCA is to stay invested while at the same time not be affected, emotionally and rationally, by the price volatility. Why? Because low prices can go lower. High prices can go higher. By DCA, there is one less dimension to consider when investing.
Don't laugh, but more than 50% overreacts when the prices go up or down by 1%/10%.
Wouldnt a beginner like yourself get heart attack when you see your capital drops by more than 50%?

Thus, start with DCA. DCA into roboadvisors. DCA into world index. Get used to the price fluctuations and create a strategy that suits you

Not true that it's only for beginners, even people like chicken genius who is a millionare uses dca strategy

Definitely. It allows me to passively invest without emotions, at a standard interval, while allowing for liquidity as I'm not putting in a huge lump sum at once.