Red, 1cent Postage Due Pair/Plate Block Question

I cant seem to find the correct year, match up to the perfs, and or coloring. So on 3 of the darker shaded ones I cant see post marks of 1916 (2) and 1915 (1), and I believe these are all rotary press. So I guess I'm getting confused on the perfs for those particular years. All these darker sharded ones are all perf 12. And then the plate block of 3 in the lighter red is with perf 11. But again all rotatory press ?

PS I am sorry in advance to the seasoned collectors for the quite seemingly, basic stamp collecting "101" questions.

I agree, something is confusing your understanding.
It would help us to help you if we knew what online or printed reference you are using to arrive at your conclusions. Then we could help you navigate your reference better.

That said,
No apology needed for basic questions. Every one of us started out in the same boat at one time. The important thing is to keep asking and learning.
This design of postage due stamp is printed by flat plates. Rotary is not used until the early 1930s with the next design type.
Terminology: Two connected stamps is a pair. 3 stamps in a row is a strip. A block is 2x2 at a minimum, or larger. A plate block will be at least 2x2 and have the sheet margin showing the plate number.

One of the deficiencies of most catalogs, including Scott, is the lack of a sorting scheme or tree to guide collectors which features to examine first, second, third (or which to ignore) for a particular series.

For the second series of postage dues which you show here, the most important feature is the perforations, whether 10, 11, or 12. Then watermarks if applicable to each of the 3 perforation groupings. Lastly, shade. These stamps were workhorse issues in utility use for many years. Shades varied quite a bit and most collectors (including me) are satisfied with getting a basic Scott number based on perforation and watermark and stopping short of the various shades.

The 4 pairs, some as you note with 1915 and 1916 cancel dates, are highly likely to be Scott J45 issued in 1910, and will have the single-line USPS watermark. Fortunately they are in pairs so each pair should easily show enough of the watermark pattern for positive identification.

The strip of 3 with the Modesto, CA precancel is clearly perf 11 from your image. It will not have a watermark and must be Scott J61, from the perforation rate alone.

Thank you for the all the info, and your time too. Much appreciated.

As far as what I use as reference, well, I suppose I still haven't a "set" information guide. I use mystic stamp for the veeerry basics if needed quickly. And here of course which is the most knowledgeable for me to actually learn from..
Here's the thing.. surprisingly, I am only 38 AND a female (which I am finding quite rare) and this is what I do all day long! Sorting and going through stamps that I have collected over the past 7-8 years or so. Mostly, from local estate sales where the people have passed on. I did it in my childhood as well, grew out of it, then clearly the passion for it never died, cause HERE I AM.. lol ! I was fortunate enough to have been successful in my "normal job" (veterinary career) but then got in a bad motorcycle accident and broke my back. Luckily, I didn't become paralyzed and still can lead a somewhat life in pain with a disability. So for now, I can do this full time or how ever long I decide in the comfort of my home. And it wasn't until just recently I decided to pull ALLLLL my boxes, binders, bags and albums of my collection and start sorting and selling. Not because I need the money... in the slightest, but because of the history of our country and believe they should be shared with other like-minded collectors and such.

So, I guess any info on what sites I could use strictly to research, as my "go-to" would be helpful. Also. what the heck should I do with ALL of these? Akron, OH overprint on every single one and about 20-30 pages full.

I created a tree a while back for the 1894 design postage dues. I hope you find this helpful.

There are many sites, but you may want to start with this comprehensive one:

https://stampsmarter.org/index.html

From there you can branch out to many specialized sites depending on what information you are looking for. This hobby is blessed with a LOT of online info. If you need something in particular just ask here and you will be shown whatever you need if it exists.