All the videos for 2.1 Algorithms in one convenient video. See below for the individual topics

Computational thinking - including what is computational thinking, abstraction, decomposition, algorithmic thinking and practice exam questions

Writing algorithms - including flowcharts and pseudocode, exam technique and practice questions

Trace tables - what they are, how to follow them, how to fill in a trace table and practice questions

Bubble sort, merge sort and insertion sort. How to carry them out, how to describe them, comparisons between them.

What is a searching algorithm, binary searches, linear searches, differences between them and how to carry them out.