Should it be 'lecture on' instead of 'lecture about'?

I would like to lecture about the following points:

1. The Buddhist terminology of netherworld,
2. The Buddhist concept of “Chu-u”, which is “intermediate existence”,
3. The distinctive feature of “intermediate existence”,
4. Near-death experience.

1. The Buddhist terminology of netherworld;
2. The Buddhist concept of “Chu-u”, which is “intermediate existence”;
3. The distinctive feature of “intermediate existence”;
4. Near-death experience.

a) Should it be lecture on instead of lecture about?
b) Which set is correctly punctuated - the first set with commas at the end of the first three sentences or the second with semi-colons ?

Thanks.