Today [I'll/ I'm going to] talk to you about Portuguese verbal conjugation.
1 - [Both are correct?]

I wanna know what is the best way to say the same thing or almost the same thing and if I am making mistakes.

I [will/ am going to] "say" [a few/a couple of] redundant phrases, just to practice English. So If [there are any / any] errors or if you have suggestions please tell me.
1 - [Both are correct?]
2 - [Both are correct?]
3 - [Both are correct?]
[So / So that] you can speak Portuguese in an easy, confident and natural way ... ie without effort, you must study the verbs.
1- [Both are correct?]
The study of verbs is crucial for you [to/can] communicate in a natural way.
[Both are correct?]

[Then] you need to understand how the verbal system of Portuguese language works!
Can I replace [then] by:
[And for this];
[So];
or [In order to do this]?

You need to learn it really well!

You need to master the use of verbs.

It is not a difficult subject, but it is [very/too] complex [one].
1- [Both are correct?]
2- Must I use "[one]"?

[You need to understand] perfectly how and when to use each tense and mood verbal
[Is it ok?]

[You must understand] perfectly how and when to use each tense and mood verbal
[Is it ok?]

You must understand [in what way/how] each tense and mood verbal [work/works].

So let's not waste time!
... let's start: