You can earn significant sums by completing online surveys at home. Amounts vary won every poll in part, by the company that wants those online surveys and in particular by the company giving you your commission.
If you do not know English well I do not recommend you to register on polling foreign sites because you can suspend the account for poor quality of responses offered fixed before asking for payment.
At some sites gain is based on points they accumulate for each completed questionnaire. For example for a brief questionnaire that takes less than 3 minutes receive 30 points while for a very long questionnaire over 30 minutes get over 150 points.
Most companies that called the service they want to see people react to certain advertising campaigns organized in the future or future products. Payment may be requested when you have accumulated a certain number of points, and this can be done by several methods including bank transfer.
I honestly do not know how paid surveys are recommended because I never participated in it. What is clear is that it is an activity in which you can earn money from home without much effort. It seems a good source of passive income considering that most online surveys requires no effort.