How I have learned English

grammatically prefered to use the past tense over the perfect past. You learned in the past.

Since I was very youngThroughout my childhood, I had always wanted to learn English, but I couldn't afford to study the languageformally.

The sentence sounds awkward. I think "Since" follwed by "always" in the sentence makes it difficult to understand your meaning. I would change it in two ways, the sentence above or as an option you could also say:
Since I was very young I wanted to learn English, but couldn't affort to study formally.
Also I am showing you that a comma can be used at the beginning or the end but using two commas in this sentence seems awkard. Comma placement is perhaps more guided by our speech patterns than it is dictated to us by hard and fast rules.

When I had started learning English on my own, I had learned it incorrectly, because I didn't know how to start.

The act of starting is the farthest in the past.

Then, after a lot of trial and error, I found some ways to learn English through self-study, and all of them are very useful in studying the language.. They have been very useful to me.

Your phrases are a bit redundant. " ways to learn through self-study" useful in studying the language" By saying "useful to me" it is understood that you are studying the language and that you are using those new ways to learn it through self-study.

And tThey are:

It is preferred not to begin a sentence with "And" when possible. Of course people do it. You may also be thinking of the well-worn phrase "And the winner is..." So yes, it is correct. But it is preferred to leave it out.

.1 Using1. Listening to ESL Podcasts:

In lists the conventional style is to indent, type the number and follow it with a period and two spaces. The choice of "using" seemed awkward to me. The activity is listening. "Using" is fine in conversation, however, it is a more general term. In the written format it is preferred to make word choices that are as precise as possible.

Podcasts are one of the best tools tofor learning English, they hav. Thre are so many episodes that will teach you something new every day, and with them, y, each with something new to learn every day. You can improve your English listening skills in no time.

.1. Using ESL Podcasts:

When writing numbered points, the . comes after the number!

Podcasts are one of the best tools to learn English, t. They have so many episodes that will teach you something new every day, and with them, you can improve your English listening skills in no time.

Great sentence, but it is a little too long (what's called a run-on sentence). I separated the first sentence because it is a complete thought.

.2. Graded Readers:

Graded Readers books are the best choice for learning the language; because s. Some English learners wouldill read something difficult that is not suitable for their levels.

Adding clarity to your statement

There comeHowever, Graded Readers Books, they will are simple, and can help you to expand your vocabulary and to enjoy reading due to their simple language.

Rewrote the content to have a more natural flow. This will keep it concise and straightforward!

.3. You have to have an English Environment:

Since I started learning English, I have changed everything that I use to English like. For example, I changed the language on my smartphone, and laptop, an to English. I even changed the people whom I follow on social media.

Split the sentences up to avoid run-on sentences. Great writing! It just needs to have some clarity. Saying "For example" is a good way to include new ideas.

Sometimes, I would ratherill listen or search aboutfor products or anything important in English rather than my native language.

.4. Writing And Speaking:

So I tried to improve them by speaking with other people on the Hallo app and, writing about my experience in learning English, or writing about myself.

When you are listing 3 or more things or actions in a sentence, use commas to separate your thoughts!

FinallyNow, learning languages is easier than ever before.

Use "now" instead of "finally" because "finally" sounds like you are finished learning. Instead, you want to say that it makes more sense now