Minimum number of transcation in blocks one must include?

Anybody as the miner can just include 1 transaction and mine 12.5 award transaction and nonce and although it may not speed up my process as (number of transaction +Award+ Nonce)=some Constant to be inside the sha256() === < target

so it does not save any calculation ?? but valid or invalid depends upon minimum one …or not

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How to only accept transactions with a minimum transaction fee [duplicate]

This question already has an answer here:

As a miner how can I only accept transactions with a minimum transaction fee? With many blocks being full it does not make sense to accept transactions with 0 or very low transaction fees and exclude higher fee transactions for a lack of space.

How can I set the minimum fee for transactions I want to confirm? Even better can I set this minimum to be dynamic based on fee data from recent blocks?

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Can anyone delineate a phrase in the Satosh’s white paper?: limiting the minimum practical transaction size

Can anyone explain what the phrase below, from the Satoshi Nakamoto white paper, means?

  1. Introduction

The cost of mediation increases transaction costs, limiting the minimum practical transaction size and cutting off the possibility for small casual transactions

Can anyone tell me what the writer tried to say?

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