Can you help me correct below ?

Motorbikes are the best traffic vehicle and are convenient for most of the people in my country. We can use motorbikes to go to work ,to school , to the market, and to do a lot of activities. Motorbikes are small, easy to move anywhere, and affordable with the income of working people.
However, besides the convenience, they also have many disadvantages such as: they cause traffic jams when you go work or school in the morning and after work and school on the way home. They also cause environmental pollution, causing traffic accidents.
Above are all I know about convenience and inconvenience when you use motorbikes.

很好！ When you talk about an object that is not specific you should make it plural (more than one).  If you were writing about your motorbike, it would be singular (just one).