Use the where operator
The where operator filters a table to the subset of rows that satisfy a predicate.
Try each of these queries separately to see the results.
SecurityEvent
| where TimeGenerated > ago(1d)
SecurityEvent
| where TimeGenerated > ago(1h) and EventID == "4624"
SecurityEvent
| where TimeGenerated > ago(1h)
| where EventID == 4624
| where AccountType =~ "user"
SecurityEvent | where EventID in (4624, 4625)