I’m 26 this year and just started working, should I start with a ETF as my first investment?

Etf is a good way to get your hands on investment and understand how investment works.
You can take a look at robo advisors. They are a portfolio of etf/ unit funds that comes at a lower cost. The capital is relatively low and yet you can be well diversified. There are many financi advisors in the robo advisors help you manage your portfolio.

Take the time to learn about investment

It's a good way to start investing with ETFs, helps you avoid potential pitfalls that investors will make.

ETF is not for everyone but it's for 90% of ppl.
If u do not have much experience and time for stock picking, ETF will b good for the start.

ETFs are a good way to start your first investment and robos can help you achieve that. I'm also planning to go with a robo as well! :)