You are right and the suggestion is also making sense. That if one don’t have a source for income and he/ she has enough  amount to invest them he should not waste time on wounding for job or to keep your money in bank for a very short and slow benefit . so if you want to do really something great , you have to save money , but that saved money can never be enough for you future as you can increase your saving for future though investment . because investment expend money with the expectation of achieving a profit , getting worker to investing your money could helping in future . so investing is right for me .

which is correct whenever you save btc you are also saving your money as bitcoin is another type of currency and the best part here is bitcoin keeps increasing its price unlike ordinary fiat which the value is just the same even banks give you 5% earnings after several months or years its not comparable with what bitcoin can bring you if you are smart enough.

If you want to invest you also have to save so they work together, the first step you have to do is to learn how to save
and if you are successful, you can allocate some for your investing but make sure you have some back up funds in
case you will not succeed in your investing journey.

I want to answer by giving example. I mined 40 eth and some xmr too. I sold all of my ETH when ETH was 0.025 I think and that thought that was a great profit. That time BTC price was around $700. I sold them and was enjoying the rewards and also paid some dues.
I lost my mining rig , there was a voltage issue and I stopped mining. And that was also a cause of selling those coins. If I could hold them, I would be rich in my country at least. I invested my time and money and it paid me back with profit.
Investing is good if you know where to invest. Sometimes it is better to cashout rather than holding. So it depends what is your project and you have to find out what will be the outcome of your efforts

Investment means giving the money to someone who uses it for their business and pays you back a dividend (and you normally get some kind of share that can be sold later). Think stocks.

"Save in bank" is actually a kind of investment. You give money to the bank, they use it for their business and give you a small interest (if at all) as dividend, and you can withdraw your money. With current interest rates, this is pretty boring, the only advantage compared to keeping money in a safe at home is that it's easier to do most types of payment, and that you don't need your own safe...

Buying precious metals is not an investment because those metals won't work with the money you paid for them. It's mostly speculation (you hope that you can sell it for a higher price) and safekeeping (real value of money can fall due to inflation, while precious metals will mostly retain their "real" value). But you need to consider storage fees.

To decide which is better you need to know what you consider "good".
Do you want to maximize your ROI? Do you want to store your wealth safely? Do you want to enable entrepreneurs to build their businesses?

You need to answer.

Yes I agree with you and that is what I always read and heard from financial agent.  You will lose some with savings due to inflation rate.  For instance, you have 2% per annum interest while at the end of the year, your savings will be less by tax and inflation.  Ending you lose a good amount of money.  So it is always better to have investment.

Putting money in bitcoin and keeping for a longer time or for any time of the future is also a type of saving money. Because bitcoin is a currency and keeping bitcoin is the same as to keep any other currency. If someone will have money in bitcoin then it is like saving money.

If you will be expert in earning money through trading and you will invest in a coin which will have a high potential to increase up in the market like bitcoin then you will not lose your money but you will earn a good profit but if someone will not know abut trade and will invest in some weaker currencies then he may lose.

I will prefer to invest some part of my money in bitcoins to let it grow in future and rest I will save for the future as if my investment fails then I need hard cash in my hands to take care of my daily expenses and that is only possible if I have saved money.