Google Sheets Formulas
Description:
Let me start by saying I’m not an Excel/Sheets guru by any means. This post is just for reference for things I have done with Google Sheets so I can search on my blog if I forget :)
To Resolve:

Creating an
if
statement. In this caseif month is January, take the values of (J25+$G2) and subtract 12000, else don't subtract 12000
:
=IF(MONTH(A26)=1,((J25+$G$2)12000),(J25+$G$2))

Same logic but for
year
instead : 
=IF(YEAR(A26)=2025, (F26700), F261430)


Here is a multiple
ifs
statement similar to aswitch
orcase
statement in other languages:=IFS(MONTH(K17)=1,(1000), MONTH(K17)=2,(2000), MONTH(K17)=3,(3000), MONTH(K17)=4,(4000), MONTH(K17)=5,(5000), MONTH(K17)=6,(6000), MONTH(K17)=7,(7000), MONTH(K17)=8,(8000), MONTH(K17)=9,(9000), MONTH(K17)=10,(10000), MONTH(K17)=11,(11000), MONTH(K17)=12,(12000) )
 It is basically saying,
give me the value of the month in K17 and I will set my cell to whatever the lookup is. So 1 = 1000, 3 = 3000, ect.
 It is basically saying,

To reference another sheets cell, you just use
=MySheet1!J16
for example. 
If you want to reference a cell’s value all the way down a column, you must do an absolute reference instead of a regular reference:

Regular:
=D8+C4

Absolute:
=D8+$C$4


To create a column with dates that are one month from today, just use the formula:
=EDATE(A28,1)
whereA28
is=TODAY()
. The EDATE function will just add the number of months in second argument. 
For compound interest, I usually do something like :
=((D54+E54)*H54)+D54+E54
if the D column is an initial balance, the E column is a yearly add balance, and the H column is the interest like .07 for example. So if
D54
was21,779.79
,E54
was600
, andH54
was.07
I would:  Put this formula in
D55
and set the formula above. It would go in this order:  1: Add 21,779.79 + 600
 2: Take that result (22,379.79) and multiply it by the interest rate, .07 = 1566.58
 3: The value from previous step is the amount of compound interest gained for the year. You then just add it to the first step once again to get your final result:
 4: 1,566.58 + 22,379.79 = 23,946.37
 5: The real power of this is you can drag the formula down over the years and see the interest gaining interest as the name implies, compound interest.
 So if

In addition to formulas, I have found that conditional formatting is super helpful as well. You can set all sorts of
if
statements there as well: If the
date
in this column is before today, make it yellow and faded.  If the
value
in this column is above2800
, mark it red.  If the value starts with
2021
mark it red. If for example you want to highlight a year or something.  Obviously tons of possibilities here.
 If the