you are already on the right track, just one more step.
scroll down a bit and look at the mempool "size" chart instead of "count" chart because it makes more sense for fee estimation since we pay fee per size not per transaction and 1 tx can take up 1 MB while 3000 transactions may still not fill a block.
the minimum block size being 1 MB and the average these days 1.2 MB helps deciding what fee is more appropriate.
I am finding it hard to understand the graphs both the count and size. A little help will be appreciated :-)
Thanks in advance. Cheers :-D
these charts are the live visualization of all the transactions that are currently waiting to be confirmed (are in memory pool). the rightmost point on the chart (as you'd expect) is the current status. so what you do is you go to that site, look at the chart saying Mempool size in MB, and try to figure out how much (as in size) transaction is paying how much fee. the numbers on the chart are the aggregated values not the value for that fee level. for example in the following picture when it shows 0.244 MB in front of 50+ it means there are 0.244 MB transaction size in total paying fees higher than 50 satoshi/byte.
now by knowing how to read the chart all you need to do is to speculate how much of this total size is going to go into next block that is found so that you can pay the smallest fee while being among them.
to do that you need to know the block size nowadays is around 1.1 MB to 1.2 MB so you simply find the ~1 MB line which is currently at 7 satoshi/byte and that is the
minimum fee you can pay to get a high priority transaction.
but you also have to keep in mind that there is a time between each block is found and in that time others are also making transactions, sometimes there can be spikes in the number of transactions during that time. so if you pay the minimum there might be a spike and you can no longer have the high priority. that is why it is some sort of speculation about fees not guaranteed.
ps.
https://bitcoinfees.earn.com/ is currently suggesting 54 satoshi/byte! look at the above chart and see where 54 is at!!!