Well for the indexing stuff I recomend Worldbrain[0]. I use it for some time now and was able to find a lot of stuff that would be otherwise lost in my browsing history. It helps mo out when there is this "I know I read something about functors and javascript like two weeks ago". Turns out it was 5 weeks ago but since Wordbrain indexes every page I visit I do not have to scroll through 2k history entries.

[0] https://worldbrain.io/