Looking on the internet deeply has found these results:

have learned to is the most popular phrase on the web.

have learned how to 110,100,000 results on the web	have learned to 128,400,000 results on the web More popular!
Some examples and use cases from the internet:	Some examples and use cases from the internet:
And they also have learned how to lose gracefully, without avenging the winner. Where it seems like someone might have learned how to commit murder. An important aspect of the area's specificity is the knowledge and skill of local producers, who have learned how to cultivate a cherry that is characteristic of this area and to adapt cultivation methods to the prevailing soil and climatic conditions. Through many tours of duty as a Commanding General, I have learned how to keep this country safe. I was diagnosed at 19,and I have learned how to deal with it. Over the years I have learned how to control my temper. Taro and Jiro have learned how to catch seals. I have learned how to forgive.	Our daughters have learned to measure their worth by the wrong scale. Not that I have learned to I'arabo school. Over the last twenty or thirty years we have learned to look at everything in economic terms. But I have learned to not always trust it. And I have learned to laugh all over again. I have learned to tell the difference between reality and hallucinations. Watchers have learned to fear men. We have learned to diary our pain onto Facebook, and we speak swiftly in 140 characters or less.

have learned how to

110,100,000 results on the web

have learned to

128,400,000 results on the web

More popular!

And they also have learned how to lose gracefully, without avenging the winner.
Where it seems like someone might have learned how to commit murder.
An important aspect of the area's specificity is the knowledge and skill of local producers, who have learned how to cultivate a cherry that is characteristic of this area and to adapt cultivation methods to the prevailing soil and climatic conditions.
Through many tours of duty as a Commanding General, I have learned how to keep this country safe.
I was diagnosed at 19,and I have learned how to deal with it.
Over the years I have learned how to control my temper.
Taro and Jiro have learned how to catch seals.
I have learned how to forgive.

Our daughters have learned to measure their worth by the wrong scale.
Not that I have learned to I'arabo school.
Over the last twenty or thirty years we have learned to look at everything in economic terms.
But I have learned to not always trust it.
And I have learned to laugh all over again.
I have learned to tell the difference between reality and hallucinations.
Watchers have learned to fear men.
We have learned to diary our pain onto Facebook, and we speak swiftly in 140 characters or less.