Here are synonyms and related phrases grouped by the core idea:

**Testing / Experimenting**
test, experiment, assay, probe, scrutinize, examine, investigate, verify, validate, evaluate, screen, check, sample, survey, analyze, dissect, study, research, pilot, field-test, road-test, audition, shakedown, workout, rehearsal, dry run, trial run, pilot study, R&D

**Trial and Error / Trying**
trial, attempt, effort, essay, venture, undertaking, tryout, try, cut and try, hit and miss, hit or miss, guess-and-check, learning by doing, exploration, speculation, tentative approach, trial balloon, feeler, fling, probe, delving, digging into

**More casual / idiomatic**
give it a go, give it a shot, have a crack at it, play around with, mess around with, fool with, futz around, see how it flies, run it up a flagpole, see how the wind blows, send up a balloon, put to the test, put through its paces, check it out, go over, look into, turn over in one's mind

**Formal / academic**
experimentation, investigation, inquiry, inquest, fact-finding, empirical study, exploratory research, heuristic method, abductive reasoning

Note: "trial and fail" is not good, 
it most commonly expressed as **trial and error** — the "error" part refers to learning from failures, not just failing outright.

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# what's knowledge

In simple form, we define knowledge as the sum of what is known.


In IT, it's information held on a computer system.

In philosophy, it's
true, justified belief; certain understanding, as opposed to opinion.
awareness or familiarity gained by experience of a fact or situation:


Generally, knowledge is facts, information, 
and skills acquired through experience or education; 
the theoretical or practical understanding of a subject:

information held on a computer system.

philosophy
true, justified belief; certain understanding, as opposed to opinion.
awareness or familiarity gained by experience of a fact or situation:

Example of using the word of knowledge in sentences:
"a thirst for knowledge"
"her considerable knowledge of antiques"

Similar words:
understanding
comprehension
grasp
grip
command
mastery
apprehension
expertise
skill
proficiency
expertness
accomplishment
adeptness
capacity
capability
savoir faire
know-how
learning
erudition
education
scholarship
letters
schooling
science
wisdom
enlightenment
philosophy
information
facts
data
intelligence
news
reports
lore
info
low-down
gen

familiarity with

acquaintance with

conversance with

intimacy with

Opposite: ignorance illiteracy