in general, with every chess puzzle, it's best to start calculating with forced moves - because your opponent's responses for these are limited, so the tree of options is narrow. therefore you can quickly discard some of these moves, or find the right one among them - saving yourself lots of time and effort in either case.
i sincerely recommend you watch the videos made by this user
YouTube - teoeo's Channel
they are really really worth watching, even more than once
myself, i am by no means a strong player, but since you seem to be a beginner, i feel entitled to give some advice from my humble knowledge
in my opinion, when faced with a chess problem, you should spend a long time READING the position (instead of looking for any particular moves)
seek for all the elements and patterns you can, and compile a list of them in your head
and then finding the right move is quite similar to solving a murder in a classical detective story

you just have to connect all the clues
for example, take a look at this puzzle (from Chesstempo)

White to play
I solved it, but - while not very hard, it only has 45.83% success rate on the server
The right move is
but why?
that's the comment i wrote under this problem (after i solved it)
click to show
"the thing to be utilized here is the strong R+Q battery we have on the d-file. that, and the knight fork on e6. black can't open the d-file, because he will lose the exhange (Q takes R, R takes Q, R takes R and we're up a rook). so once the bishop is out of the way, we see that the e6 pawn is in fact undefended, which allows the fork. the bishop needs to take one of three minor pieces that surround him. why the e5 knight? because that's the only piece that Black cannot recapture with his Queen (thus moving her away from the knight fork we're preparing)"
by playing Bxe5, we win material and gain completely winning advantage, because our knight will take either the rook or the queen.
- so that was the reasoning i used. as you can see, solving it (even without knowing what kind of tactics it was - a mating attack, winning material? on Chesstempo you're not told that in advance, just like you aren't in real games) was based on having carefully READ the position. you had to notice 1. the battery... 2. the fork... 3. the pin. then realize what they all "mean" combined - and draw the right conclusion. failing to spot any of the themes, you couldn't see the correct move
i don't know if this problem looks difficult for you, but difficulty is only a matter of greater or smaller complexity of the task... while general principle remains the same
so i'd say; start by "scanning" the whole board pedantically, and like a police inspector - write every even slightly suspicious detail down

examine the forcing moves (as both JrChess and Teoeo say), examine all the relations/interactions between the themes you have found in the position - seeking for any fruitful ones.
do you guys agree
and final words of advice come to you from "Fatal1ty"

world champion of various computer games =>
YouTube - Fatal1ty - Practice time
- i hope it helps