In order to have a strong thesis statement, I suggest walking through a couple of early steps to find out how you should approach it. For example, you might start with a simple statement:
I think abortion is ________.
Now, ask yourself why you feel that way. What have you read that informs your opinion? What could you use as evidence? After that, you might build on to it a little.
I think abortion is ________ because ________.
At this point, you should not only have your opinion on abortion, but also several reasons to support it. You're moving into thesis territory! However, remember that a thesis will always have a counterpoint. Especially a hot topic such as this one. You should include an acknowledgment of this. For example:
Although many believe that abortion is ____________, I think abortion is _________ because _____________.
Now we're getting somewhere! At this point, you have a thesis statement that is supported by reasons / evidence and includes a counterpoint. This is sufficiently complex and does multiple things for your readers: It tells them what you think on the issue, why you think that way, what a popular counterargument it, and it lays out a "map" for your essay.
Oh hi! Thanks for stopping by. The first thing you should do is to define your essay type. Different essay types may require different approaches and different thesis statements.
For example, a good thesis statement for an argumentative essay may look as following:
E.g. The most effective solution for the problem of poverty in Africa would be improved education system and better access to education, rather than humanitarian aid from developed countries.
Be sure to choose only the arguments you will be able to illustrate and develop in your essay. Feel free to revisit your thesis statement and rewrite it while you work on your paper and want to add or change something. If you decide to use the thesis statement suggested above, you will need to write one paragraph discussing a relationship between literacy of population and economic development of the country. Another paragraph should shed light on the current situation in Africa. Try to find the latest stats on education and economy in Africa. Numbers often speak louder than words when you need to illustrate your point and to persuade readers to share your position. The third paragraph should address the question of humanitarian aid and the attitude of the locals to it. Finally, make sure to repeat your thesis statement in the conclusion part, but use different wording.
Good luck and do let us know how it goes with your essay.