WThen were are several benefits to learning a foreign language well, we will get good results.

Using a gerund here helps setup up the list you explain later

As iIf we learn a foreign language well, our competitive ability in finding jobs increases and we can findability to compete for jobs at good companies increases.

"as" shouldn't be used here, the second half feels a bit verbose with two separate coordinating clauses

Also if we are good at foreign languages, those things such as studying abroad, traveling abroad, or immigration can bng become easier to do.

"those things such as" is unnecessary, you can just list the actions and it sounds much more natural

By studying abroad, traveling abroad or immigration , we can achieve several knowledge and different experienceThrough these activities, we can gather new knowledge and experience different things.

It's reasonable to use "these activities" to reference the prior sentence rather than needing to write everything out again. Gather is a better suited verb, and I would switch experiences from a noun to verb (since gather works for knowledge, but less so for experiences)

First, learning a foreign language is useful in looking for a job or for daily living.

AsBecause if we learn a foreign language well, our competitive ability in finding jobs increases and we can find good companies.

The phrase "as if" can be used as "as though" or "like". This sentence isn't wrong since you're using "as" to mean "because" and you're not using the phrase "as if", but to avoid ambiguity, I'd recommend changing the word to "because" instead.

Also if we are good at foreign languages, those things such as studying abroad, traveling abroad or immigrationg can be easier to do.

By studying abroad, traveling abroad, or immigration ng, we can achieve severalgain a lot of knowledge and have different experiences.

It sounds better if the items in a list are grammatically similar. For example, if one item is a noun, the other items should be nouns. If one item is a verb, then the other items should also be verbs.

When we learn a foreign language well, we wi'll get good results.

We will is fine grammatically, it just sounds awkward.

First, learning a foreign language is useful in looking for a job or living abroad.

As if we learn a foreign language well, our competitive ability in finding jobs increases, and we can find good companies.

Also, if we a're good at a foreign languages, those things such as studying abroad, traveling abroad, or immigration can be easier to do.

By studying abroad, traveling abroad, or immigration (?) , we can achieve several pieces of knowledge and go through different experiences.

First, learning a foreign language is useful in looking for job or livingfor daily life.

As iIf we learn a foreign language well, our competitive ability in finding jobs increases and we can findwill be able to get employment at good companies.

Also if we are good at foreign languages, those things such as studying abroad, traveling abroad or immigration canng will be easier to do.

By studying abroad, traveling abroad or immigrationg , we can achieve severalgain knowledge and different experiences.