Yeh altcoins is safe for investment but there is one thing which would you set in mind that if you want investment in altcoin then you should choose the top 10 altcoins of CoinmarketCap.
Because they are trusted and real his team are real not fraud those reason put the project in list of top coins of CoinmarketCap .
But if you buy rather than that then there will be 99% chance of fraud so be careful
For long term hold choosing the top 10 is a good choice, But if you want some true profits you need to find a hidden gem in low market cap cryptocurrency. that is the place where most money is made.
hidden gem will give us more profits than top 10 project in coinmarketcap. investing in hidden gem will need our patience due progress developtment still running and no one product release. but personally this kind of project will give me atleast 5x profits when new investors find it. be our opportunity if we can be early investors.
to find hidden gem must research on atleast 50 projects. One of in the project list should be our hidden gem based on project plan , utitlity or usecase , marketcap or another thing. its really promising project if we could find gem , atleast in a year while product released it give us more than 10x. this is based on my experience when investing in new project with good future.