How do I find work at home and do not invest money to assemble products or so?

That can be a tricky one. There are plenty of "get rich quick" schemes online and they all prey on one thing... people's greediness to make money as quickly and easily as possible. First let me discuss what to avoid...

1) Chain letters. You've probably seen it... it starts with something disguised as news or a testimonial. Then you get on to the pitch, which is, here is a list of people and you have to send $5 cash to each of them, requesting a "report". Then you drop off the bottom person and put your name on the top and start spamming everyone on the internet hoping to get more gullible people to sign up.

2) Paid surveys. Yeah, all these companies with products are just itching to give away millions on research by giving every lucky participant a bundle of cash. Or a $500 gift card to your favorite retail store. Or a new laptop.

3) Home-based data entry or typing. If they try to charge you a fee to get into their "training program" then it would probably be better to pass.

4) Multi-level marketing. This actually comes in two flavors, scams, and legitimate opportunities. The latter can then be sub-divided into different groups, those that offer legitimate useful product at a reasonable cost, and those that have over-priced products just to pay all the people "bonuses" for signing up other people.

I think #4 offers the best potential IF one can find an honest company with a product that offers value at a price so reasonable that "selling" it is a no-brainer. On top of that, the company should show integrity and maybe even have full financial disclosure right on the website to build the trust of customers and potential associates.

Since I have yet to find such a company, I'm actually doing some brainstorming right this minute on what types of features a website should have to implement this.

In fact, I was almost about to post a question with a similar theme. If anybody wants to know more, and has a bit of talent in sales, teaching, or writing, feel free to give me a holler. I'd be glad to share details, get feedback, etc. Until then, best wishes for your search!