Most modern lite­ra­tu­re refers to just OKRs (https://www.perdoo.com/the-ultimate-okr-guide/) but I pre­fer adding Goals to it as well – as Mic­ro­soft did back in the 90´s. You need to have defi­ned a clear Goal first befo­re Objec­ti­ves makes sen­se. Anyway, the ope­ra­tio­nal stuff is cap­tu­red in the OKRs (wit­hout the G) so no need to split hair on seman­tics, both work.

The power of the OKR dri­ven ope­ra­tion is explai­ned well in (https://www.amazon.com/Measure-What-Matters-Google-Foundation/dp/0525536221). If you google “mea­su­re what mat­ters” you find a lot of mate­rial, You­tu­be videos etc to give you a crash cour­se. Though the examples in the book are very big com­pa­nies, the met­hod works well for star­tups as well. Actual­ly they may be even more cri­tical for a star­tup, as “what mat­ters” is depen­dant on the sta­ge of the J Cur­ve you are at. As you make progress, “what mat­ters” should chan­ge. The thing to dri­ve your eve­ry­day acti­vi­ty is the Key Result. The name is a bit mis­lea­ding, it should rat­her be “Key Acti­vi­ty”, but this is the stan­dard term so we stick with it.