these are mostly for altcoin trading and very little for bitcoin.
(A)When Buying coin don't enter with whole money at once, accumulate(Buy slowly as its going dip)and Always use stop Loss in your all trades(3-5% below the Buying zone)!!
you can't give this as a general advice. someone may have $10 and what you say is true for them but someone else may have $10000 and this advice is terrible for them. it may be better for the second guy to invest little by little. in fact it is best to set multiple buy orders and buy slowly.
additionally when you talk about altcoins buying while they are dropping is very bad because their drops usually don't stop because it is a pump and DUMP.
and finally stop loss won't work for this market, specially if you place it at 3-5%. it is mandatory to use it but it is different here and each coin needs its own percentage.
(B) Dont be Greedy, Exit trade as you earn 5-10% profit!!!
again you can not generalize this either.
some shitcoins get pumped 200% in less than 6 hours. getting out at 5% is not being greedy it is called being unfamiliar with the market.
in some other cases some other shitcoins can't even be pumped 5% so not getting out is dumb!
(C)Its better to keep 20-35% free btc in case of market crash then you buy cheap alts in diiiip!!
this is vague at best.
what alts? what is cheap? just because some altcoin got dumped doesn't mean it is "cheap"...
(D) For the risk management Don't put all your funds in one coin!! Try to divide it depending on your portfolio amount!!Hold atleast (3-8coins)!!
i disagree with this completely. altcoins are not good for "portfolios" look at the market and see all of them in red right now that bitcoin is in red! some of them more than others.
dividing your money is not going to give you any benefits here.