Above all, my grammar, because I think that it`s the most complícate for Icommunicating in the correct form is the most comunplicate of correct formd thing. Above all, my grammar, because I think that communicating in the correct form is the most complicated thing.

A bit more natural and easier to understand

Above all my grammar, because I think that it`s the most complíicated for Ime to communicate ofin the correct form. Above all my grammar, because I think that it`s the most complicated for me to communicate in the correct form.

You are right :)

Hi . This is my firtst time ion this appwebsite. Hi. This is my first time on this website.

Technically, this is a website and not an application

Hi This is my firtst time in this app. Hi This is my first time in this app.

Please , Iif someone looksees this posted please, help me with (the) grammar. Please, if someone sees this post, help me with (the) grammar.

A bit of nuance, "THE grammar" means you are asking for help specifically with this post. But if you just write "grammar," it will be understood that you are generally asking for grammar for all of your posts in the future

Please , Ifcould someone look at this posted please and help me with the grammar. Please could someone look at this post and help me with the grammar.

I need to improve my eEnglish in all skillareas. I need to improve my English in all areas.

Or, "I need to improve my English skills." "English" is always capitalized

I need to improve my english in all skills. I need to improve my english in all skills.

I need to improve all of my English skills.

I will keep to practicing every day until I improve my skill. I will keep to practicing every day until I improve my skill.

I will keep to practicing every day until I improve my skill. I will keep practicing every day until I improve my skill.