All you need is knowledge and understanding. Without these two elements, no amount of important tips can really help you in the Bitcoin market. Knowledge and understanding will let you know when to buy or invest and when to sell. Knowledge and understanding also helps you to develop plans and strategies to suit the current market pattern of the market. Tips are just addons, they don't really influence the profits or loses you are gonna make.

1. = always invest on the amount you can afford to lose, dont get all in or risk your life savings
2. = Falling prices doesnt indicate that it is the best time to buy.
3. = No common on this one
4-6. This do talks about on self decisions basing of your experience.

Just dont let yourself too greedy and set up goals and as long you do make out profits then that what matter most.

I agree with you about fiat-crypto comparison after you bought it.

But IMO a man should buy only the amount he's ready to lose! This is an investment as anything else, and we shouldn't be reckless!

You can buy as much as you can, but you must know what the risk is, so you can prepare if the worst thing happens to you or see the price drops significantly. Buy on the floor is right, but we will see that is not easy to find the lowest price to buy, so you can only buy after you make analysis, and no matter what price you place the order buy or sell, you should not regret it. Do not panic if you see bitcoin price drops, but you should stay calm for a while to see if you have a chance to buy more or you need to wait for a while.

Buy as much as you can from your own money, and from your spare money. At least, you should never take any loan to buy crypto and should have enough reserved money to use in life.

You said opposite things in your sentence. I know it is challenging to be correct and buy at floors but buying at dips is wisely and to do that you must wait for corrections or pull-backs. To wait, you need to have patience.

What is tetra?

I am not sure that I understand it.

Sure. Trade or invest emotionally cause losses. Two weapons for you: Stop-loss and Stop-limit orders.

One of the Best Weapons in Trading
What Is a Stop-Limit Order?

Your advice is so complicated since there are various reasons that needed to consider and your statements sometimes really not necessarily needed to do. Since we should buy some bitcoins which we think we can afford since if we buy using all of our fortune then it's a big mess for us if the market crash and, I'm sure you cannot get yourself calm when you see your fortune melting for the said crash.

The trader was probably suggesting leverage was used. When leveraging; you get to trade more money than you invest at a certain ratio, like 1:10. This means for every $1 you put in, you have a 10× leverage meaning $10 to trade with, and your profit would be based on $10$ not your actual trade amount.
This is quite risky as your losses are also based on your leverage, so if you lose 10% of your leveraged $10, you have basically lost your entire initial deposit.

A lot of beginners are now coming into the world of crypto and advice is good for them. Buying bitcoin is such good advice as of these days but it would be better if they have to wait first for the price to go down, $35k is still a huge amount of money and it could still go down if you want to earn money then spend your time observing the market that will make you better in earning good money in bitcoin.

I would like to add, buying with as much as you can afford to lose; when people start getting, understanding and/or implementing this concept, they will be more guided and directed into investing or buying the right way. There is no essence buying with everything you have just to gain more and when the market dumps, you start panicking and at the long run, selling at lose, but if you buy with what you can afford, you will be better suited to make good decisions such as when the market dumps, you will hardly be disturbed but look towards the future. Also, I wish to add to number 2, that is, if someone is looking towards long term, I think it is quite better waiting for correction unless it is in the case of institutional investors. I do not quite understand point 3, but I think holding Tether for long term is not a good idea and lastly, the point 6 is very important, emotions needs to be put in check.