Diversification is key. At the end of the day, savings/investing anything is a good practice, but as you grow and experience more ups and downs of the market, you will learn what your risk tolerance is and what assets you prefer.
How I see Investments (not all, but the biggest):
Yourself! - Invest in your education, health, and well-being... yes, this includes traveling and experiencing things that make you happy!
Real Estate - Your own home, rentals, commercial, etc. One thing to remember is, real estate requires work and continued investment to maintain. Don't be fooled when people tell you it's completely passive!
Gold/Silver - time tested store of value. Industrial applications as well.
Businesses - I'm talking about businesses you run, own, or at least own enough of to influence operations. Great way to generate value directly.
Stocks - the first thing people think of when investing these days. Investing in companies, big or small, means you trust their leadership to make good decisions and grow the value of your stock, or continue to pay dividends.
Bonds - Your parents/grandparents investments. Safe, stable, unsexy.
Forex - for the Macro-Economists and students of arbitrage.
Cryptocurrency - the newest investment class that is arising to change the standard of value across all economies.
Many options, many strategies, just remember to do your homework and understand the risk associated with various investments.