Indeed bitcoin is a good investment, but let us not forget that putting all your apples in one basket is not a good idea. It is better to learn about possible investment options before stepping in to put money here and there. Pros and cons exist in every sector and even though on this forum the bitcoin investment might sound like an echochamber, outside the forum you will not find it to be so.

In reality yes, keep crypto limited to only bitcoin, but also explore real estate, precious metals, bonds, stocks relevant as per the country where one lives. If you are going for the long term route for each of them and have a stable enough income, you can grow your money safely over the years with all these combined in a different weightage ratios.