The winning is big for Liverpool if we only see the final result but during the match, it was not easy for Liverpool. They dominated this match, created many opportunities but had to wait till early of second half to get an opening goal. After that, it's an equalizer for Newcastle United by Isak. Even when Liverpool scored two more goals to lead 3 -1, they let Newcastle United to have another goal to make it only 3 -2. No guarantee that Liverpool can win the match with that temporary result but finally, Jota found a penalty for them, and Salah nailed the winning.
The Magpies come to Anfield with many shortcomings. Several main players were sidelined due to injuries, such as Trippier. Trying to get the best result against Liverpool on paper will definitely not work, but they can put up no less good resistance even though they have to admit defeat 4-2.
Liverpool won and the victory was not a big victory but an important victory to maintain their position in the standings table.
This victory made Liverpool ahead by 2 points from Manchester City, which I calculated from Manchester City's 20 matches even though currently they have only played 19 times.
A team experiencing a crisis will find it difficult to win against a team that is in the best form. Like Newcastle, when a storm of injuries occurs in their squad, it is difficult to explain what strategy is good for the coach to implement.