What is a difference between LO and LOL? How to use them properly?

May I learn using 'against' in making comparison? Are there any other words being used for making comparison?

Shall we use 'completing' next to 'after'? There are probably 2 points ie., usages of 'complete', 'completing', and 'completed'; and which one should follow a word 'after'?

What is the easiest way to understand about English tenses? Is there a technical learning?

Is this a good sentence? I'm going to return message to customer who had sent a thanking and compliment letter to my hospility. May I say "Dear,...you are welcome. I am please to support you to whatever I can. We are partner. I'm also looking forward for a better cooperation in future. Sincerely yours..." Any suggestion?

What does difference between Explaination and Elaboration? Sample sentenses please....mtks

Building up a beautiful context. How it is different between "Paradigm" or "Paragon". I want to build up a beautiful slogan or mooto relating to logistics services.

May I use "represent" in expressing a meaning of something?

What are differences between "continue" and "keep on"? In terms of usages please. Meanwhile, please also introduce if any other words having same meaning and usage. Mtks.